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i always underestimate caesar. he's a complete opposite from logan..they're both sweethearts but while logan is so laidback and will do pretty much whatever i tell him to do for a photo, caesar takes a bit of prodding, and food! logan will do it for the praise, caesar basically says " screw you, show me the treats and i'll give it a try", LOL
i don't have much patience to begin with so him and i usually butt heads, not today though. i had a pocketfull of little milkbones and he climbed right up into the chair like i asked. he didn't stay long and i had to make him go back and do it again because my first set of photos were blurry-not to mention logan snuck in to the one frame and sat beside the chair, but we got it done right the second time!
(2 more photos in the comments)
First time i have seen this beauty at the harbour, she looked magnificen
Ship Name : Vectis Pride
Yard no. : 997
Delivery date: August 2012
Type: Multi-purpose low emission dry cargo ship
Yard: Jiangsu Yangzijiang Shipbuilding Co Ltd, China
Port of Registry: Douglas
Flag: Isle of Man
Classification: BV
P+I: Standard
Notation: 100 A5 E3 G IW NAV-O BWM DBC DG Multi-Purpose
Dry Cargo Ship, Equipped for Carriage of Containers,
Strengthened for Heavy Cargo Machinery: MC E3 AUT EP 2011
Ice Class: Finnish Swedish 1A
Technical Management: Green Fleet
Length o.a. : 123.95 m
Beam mld. : 17.40 m
Depth moulded to main deck: 11.40 m
Draft: 8.00 m
Air draft in ballast: approx 33 m
Deadweight (approx): 10252 tonnes
Gross tonnage : 7227
Net tonnage : 3124
Volume cargo hold 1: 3234m3
Volume cargo hold 2: 9420m3
Total cargo hold volume (excl tweendeck): 12655m3 =446900 cuft
Heavy fuel oil: 252 m3
Gas oil: 222 m3
Ballast water: 4324 m3
Fresh water: 69 m3
At sea in good weather conditions: about 11.5 knots on
about 11.5 mt IFO 380 cst Eco speed: about 10.0 knots
on about 8 mt IFO 380 cst
no G.O at sea, 1.5 mt in port idle / 2.5 mt working
Efficiency Monitoring System : Fitted
Above parameters are based in good weather conditions whilst vessel on even keel, maximum force 3 in Beaufort scale and sea state 2 in Douglas scale, no negative currents, swells or tidal streams and in temperate water.
Main Engine: MAK 6M32C
Aux Engine: CAT C-18 Acert DITA, 400 ekW, 1500 rpm
Shaft generator: AEM SE 400 S4, 525 kVA, 1500 rpm
Emergency Generator: CAT C-18 Acert DITA, 275 ekW, 1500 rpm
IMO number: 9626132
TPC: 20.2 t/cm
Panama NT: 6145
Suez NT: 6749
WLTHC in ballast: 9.6 m aft / 8.2 m fore
Call Sign: 2FVR8
ISPS: Compliant
CO2 holds: Yes
Dehumidifiers holds: No
So, this is our weather at the moment! Thank goodness, by Saturday 24 December, it is supposed to soar to -4°C. Such a shame that there are Christmas Bird Counts at this time of the year, but it doesn't seem to be stopping people from going.
Minus 28°C = -18.4°F
Minus 43°C = -45.4°F
Does this extremely cold weather close schools? No!
Feeling SO thankful for my warm, cosy home!
Belgian postcard by Nieuwe Merksemsche Chocolaterie S.P.R.L., Merksem (Anvers), no. C 18. Photo: Columbia. Larry Parks and Barbara Hale in Jolson sings again (Henry Levin, 1949)
Barbara Hale (1922-2017) was an American actress best known for her role as confidential secretary Della Street in the television series Perry Mason (1957–1966), earning her a 1959 Emmy Award for Outstanding Supporting Actress in a Drama Series. She reprised the role in 30 Perry Mason movies for television (1985–1995). Her film roles included The Window (1949), in which she starred as the mother of a boy who witnesses a murder.
Barbara Hale was born in DeKalb, Illinois, in 1922. She was the daughter of Wilma (née Colvin) and Luther Ezra Hale, a landscape gardener. She had one sister, Juanita, for whom Hale's younger daughter was named. In 1940, Hale graduated from Rockford High School in Rockford, Illinois, and then attended the Chicago Academy of Fine Arts, planning to be an artist. Her performing career began in Chicago when she started modelling for a comic strip called 'Ramblin' Bill' to pay for her education. She was also one of the original 'Dr Pepper' girls featured in the soda company's calendars in the 1940s and 1950s. Hale moved to Hollywood in 1943, and under contract to RKO Radio Pictures, made her first screen appearance (uncredited) in Gildersleeve's Bad Day (Gordon Douglas, 1943). She continued to make small uncredited appearances in films, until her first credited role alongside Frank Sinatra in Higher and Higher (Tim Whelan, 1943). She even sang with him in the film. Hale had leading roles in such films as West of the Pecos (Edward Killy, 1945) with Robert Mitchum, and Lady Luck (Edwin L. Marin, 1946) opposite Robert Young which she described as her first 'full stardom' and 'her fifth A picture', and The Window (Ted Tetzlaff, 1949). Her roles in 1950s films such as the adventure Lorna Doone (Phil Karlson, 1951); the comedy The Jackpot (Walter Lang, 1951) with James Stewart; the drama A Lion Is in the Streets (Raoul Walsh, 1953), and the Western Seminole (Budd Boetticher, 1953) with Rock Hudson. continued Hale's run of successful films during that decade. The Western The Oklahoman (Francis D. Lyon, 1957), co-starring Joel McCrea, would mark Hale's last leading role in a film. She seldom appeared in film after this time, but was part of an all-star cast in Airport (George Seaton, Henry Hathaway, 1970), playing the wife of an airline pilot played by Dean Martin. Hale's final appearance in a feature film was in the drama Big Wednesday (John Milius, 1978) as Mrs. Barlow, the mother of the character played by Hale's real-life son William Katt.
Barbara Hale was considering retirement from acting when she accepted her best-known role as legal secretary Della Street in the television series Perry Mason, starring Raymond Burr as the titular character. The show ran for nine seasons from 1957 to 1966, with 271 episodes produced. She appeared in 263. The role won Hale a Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series. In 1985, Hale and Burr (by then the only surviving cast members from the original series) reprised their roles for the TV movie Perry Mason Returns. The film was such a ratings hit, that a further 29 TV movies were produced until 1995. Hale continued her role as Della in the four telefilms produced after Burr's death in 1993, subtitled A Perry Mason Mystery (and starring Paul Sorvino as Anthony Caruso in the first film and Hal Holbrook as 'Wild' Bill McKenzie in the remaining three). Hale is thus the only actor to feature in all 30 films. Hale's career became inextricably linked with that of Perry Mason co-star Burr; she guest-starred in Murder Impromptu, a 1971 episode of his next series, Ironside. Her last on-screen appearance was a TV biographical documentary about Burr that aired in 2000. In 1945 during the filming of West of the Pecos, Hale met actor Bill Williams (birth name Herman August Wilhelm Katt). They were married for 46 years from 1946 until Williams' death from cancer in 1992. The couple had two daughters, Jodi and Juanita, and a son, actor William Katt. Williams made guest appearances on four episodes of Perry Mason in the 1960s. Their son, William Katt played detective Paul Drake, Jr., alongside Hale in nine of the Perry Mason TV movies from 1985 to 1988. Hale guest-starred in Katt's series, The Greatest American Hero in which Katt played the title role, aka Ralph Hinkley; Hale played Hinkley's mother in the 1982 episode, Who's Woo in America. Barbara Hale died at her home in Sherman Oaks, California, in 2017, of complications from chronic obstructive pulmonary disease. She was 94 years old. She is interred in the Forest Lawn Memorial Park (Hollywood Hills) next to her husband.
Sources: Wikipedia and IMDb.
And, please check out our blog European Film Star Postcards.
The Sahara (/səˈhɑːrə/, /səˈhærə/) is a desert spanning across North Africa. With an area of 9,200,000 square kilometres (3,600,000 sq mi), it is the largest hot desert in the world and the third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic.
The name "Sahara" is derived from Arabic: صَحَارَى, romanized: ṣaḥārā /sˤaħaːraː/, a broken plural form of ṣaḥrā' (صَحْرَاء /sˤaħraːʔ/), meaning "desert".
The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and the Sudan.
It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.
For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 20,000-year cycle caused by the precession of Earth's axis (about 26,000 years) as it rotates around the Sun, which changes the location of the North African monsoon.
Geography
The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers 9 million square kilometres (3,500,000 sq mi), amounting to 31% of Africa. If all areas with a mean annual precipitation of less than 250 mm (9.8 in) were included, the Sahara would be 11 million square kilometres (4,200,000 sq mi). It is one of three distinct physiographic provinces of the African massive physiographic division. Sahara is so large and bright that, in theory, it could be detected from other stars as a surface feature of Earth, with near-current technology.
The Sahara is mainly rocky hamada (stone plateaus); ergs (sand seas – large areas covered with sand dunes) form only a minor part, but many of the sand dunes are over 180 metres (590 ft) high. Wind or rare rainfall shape the desert features: sand dunes, dune fields, sand seas, stone plateaus, gravel plains (reg), dry valleys (wadi), dry lakes (oued), and salt flats (shatt or chott). Unusual landforms include the Richat Structure in Mauritania.
Several deeply dissected mountains, many volcanic, rise from the desert, including the Aïr Mountains, Ahaggar Mountains, Saharan Atlas, Tibesti Mountains, Adrar des Iforas, and the Red Sea Hills. The highest peak in the Sahara is Emi Koussi, a shield volcano in the Tibesti range of northern Chad.
The central Sahara is hyperarid, with sparse vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub, with trees and taller shrubs in wadis, where moisture collects. In the central, hyperarid region, there are many subdivisions of the great desert: Tanezrouft, the Ténéré, the Libyan Desert, the Eastern Desert, the Nubian Desert and others. These extremely arid areas often receive no rain for years.
To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb, the Sahara borders the Mediterranean forest, woodland, and scrub eco-regions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White and geographer Robert Capot-Rey, the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto, a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The northern limit also corresponds to the 100 mm (3.9 in) isohyet of annual precipitation.
To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Important cities located in the Sahara include Nouakchott, the capital of Mauritania; Tamanrasset, Ouargla, Béchar, Hassi Messaoud, Ghardaïa, and El Oued in Algeria; Timbuktu in Mali; Agadez in Niger; Ghat in Libya; and Faya-Largeau in Chad.
Climate
The Sahara is the world's largest hot desert. It is located in the horse latitudes under the subtropical ridge, a significant belt of semi-permanent subtropical warm-core high pressure where the air from the upper troposphere usually descends, warming and drying the lower troposphere and preventing cloud formation.
The permanent absence of clouds allows unhindered light and thermal radiation. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal chance of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The subtropical ridge is the predominant factor that explains the hot desert climate (Köppen climate classification BWh) of this vast region. The descending airflow is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert: this is the sunniest, driest and the most nearly "rainless" place on the planet, rivaling the Atacama Desert, lying in Chile and Peru.
The rainfall inhibition and the dissipation of cloud cover are most accentuated over the eastern section of the Sahara rather than the western. The prevailing air mass lying above the Sahara is the continental tropical (cT) air mass, which is hot and dry. Hot, dry air masses primarily form over the North-African desert from the heating of the vast continental land area, and it affects the whole desert during most of the year. Because of this extreme heating process, a thermal low is usually noticed near the surface, and is the strongest and the most developed during the summertime. The Sahara High represents the eastern continental extension of the Azores High, centered over the North Atlantic Ocean. The subsidence of the Sahara High nearly reaches the ground during the coolest part of the year, while it is confined to the upper troposphere during the hottest periods.
The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by its geographical configuration and location. Indeed, the extreme aridity of the Sahara is not only explained by the subtropical high pressure: the Atlas Mountains of Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier, causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates.
The primary source of rain in the Sahara is the Intertropical Convergence Zone, a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and southern Sahara. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by: extremely low, unreliable, highly erratic rainfall; extremely high sunshine duration values; high temperatures year-round; negligible rates of relative humidity; a significant diurnal temperature variation; and extremely high levels of potential evaporation which are the highest recorded worldwide.
Temperature
The sky is usually clear above the desert, and the sunshine duration is extremely high everywhere in the Sahara. Most of the desert has more than 3,600 hours of bright sunshine per year (over 82% of daylight hours), and a wide area in the eastern part has over 4,000 hours of bright sunshine per year (over 91% of daylight hours). The highest values are very close to the theoretical maximum value. A value of 4300 hours (98%) of the time would be[clarification needed] recorded in Upper Egypt (Aswan, Luxor) and in the Nubian Desert (Wadi Halfa). The annual average direct solar irradiation is around 2,800 kWh/(m2 year) in the Great Desert. The Sahara has a huge potential for solar energy production.
The high position of the Sun, the extremely low relative humidity, and the lack of vegetation and rainfall make the Great Desert the hottest large region in the world, and the hottest place on Earth during summer in some spots. The average high temperature exceeds 38 to 40 °C (100.4 to 104.0 °F) during the hottest month nearly everywhere in the desert except at very high altitudes. The world's highest officially recorded average daily high temperature[clarification needed] was 47 °C (116.6 °F) in a remote desert town in the Algerian Desert called Bou Bernous, at an elevation of 378 metres (1,240 ft) above sea level, and only Death Valley, California rivals it.
Other hot spots in Algeria such as Adrar, Timimoun, In Salah, Ouallene, Aoulef, Reggane with an elevation between 200 and 400 metres (660 and 1,310 ft) above sea level get slightly lower summer average highs, around 46 °C (114.8 °F) during the hottest months of the year. Salah, well known in Algeria for its extreme heat, has average high temperatures of 43.8 °C (110.8 °F), 46.4 °C (115.5 °F), 45.5 °C (113.9 °F) and 41.9 °C (107.4 °F) in June, July, August and September respectively. There are even hotter spots in the Sahara, but they are located in extremely remote areas, especially in the Azalai, lying in northern Mali. The major part of the desert experiences around three to five months when the average high strictly[clarification needed] exceeds 40 °C (104 °F); while in the southern central part of the desert, there are up to six or seven months when the average high temperature strictly[clarification needed] exceeds 40 °C (104 °F). Some examples of this are Bilma, Niger and Faya-Largeau, Chad. The annual average daily temperature exceeds 20 °C (68 °F) everywhere and can approach 30 °C (86 °F) in the hottest regions year-round. However, most of the desert has a value in excess of 25 °C (77 °F).
Sand and ground temperatures are even more extreme. During daytime, the sand temperature is extremely high: it can easily reach 80 °C (176 °F) or more. A sand temperature of 83.5 °C (182.3 °F) has been recorded in Port Sudan. Ground temperatures of 72 °C (161.6 °F) have been recorded in the Adrar of Mauritania and a value of 75 °C (167 °F) has been measured in Borkou, northern Chad.
Due to lack of cloud cover and very low humidity, the desert usually has high diurnal temperature variations between days and nights. However, it is a myth that the nights are especially cold after extremely hot days in the Sahara.[citation needed] On average, nighttime temperatures tend to be 13–20 °C (23–36 °F) cooler than in the daytime. The smallest variations are found along the coastal regions due to high humidity and are often even lower than a 10 °C (18 °F) difference, while the largest variations are found in inland desert areas where the humidity is the lowest, mainly in the southern Sahara. Still, it is true that winter nights can be cold, as it can drop to the freezing point and even below, especially in high-elevation areas.[clarification needed] The frequency of subfreezing winter nights in the Sahara is strongly influenced by the North Atlantic Oscillation (NAO), with warmer winter temperatures during negative NAO events and cooler winters with more frosts when the NAO is positive. This is because the weaker clockwise flow around the eastern side of the subtropical anticyclone during negative NAO winters, although too dry to produce more than negligible precipitation, does reduce the flow of dry, cold air from higher latitudes of Eurasia into the Sahara significantly.
Precipitation
The average annual rainfall ranges from very low in the northern and southern fringes of the desert to nearly non-existent over the central and the eastern part. The thin northern fringe of the desert receives more winter cloudiness and rainfall due to the arrival of low pressure systems over the Mediterranean Sea along the polar front, although very attenuated by the rain shadow effects of the mountains and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Biskra, Algeria, and Ouarzazate, Morocco, are found in this zone. The southern fringe of the desert along the border with the Sahel receives summer cloudiness and rainfall due to the arrival of the Intertropical Convergence Zone from the south and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Timbuktu, Mali and Agadez, Niger are found in this zone.
The vast central hyper-arid core of the desert is virtually never affected by northerly or southerly atmospheric disturbances and permanently remains under the influence of the strongest anticyclonic weather regime, and the annual average rainfall can drop to less than 1 millimetre (0.04 in). In fact, most of the Sahara receives less than 20 millimetres (0.8 in). Of the 9,000,000 square kilometres (3,500,000 sq mi) of desert land in the Sahara, an area of about 2,800,000 square kilometres (1,100,000 sq mi) (about 31% of the total area) receives an annual average rainfall amount of 10 millimetres (0.4 in) or less, while some 1,500,000 square kilometres (580,000 sq mi) (about 17% of the total area) receives an average of 5 millimetres (0.2 in) or less.
The annual average rainfall is virtually zero over a wide area of some 1,000,000 square kilometres (390,000 sq mi) in the eastern Sahara comprising deserts of: Libya, Egypt and Sudan (Tazirbu, Kufra, Dakhla, Kharga, Farafra, Siwa, Asyut, Sohag, Luxor, Aswan, Abu Simbel, Wadi Halfa) where the long-term mean approximates 0.5 millimetres (0.02 in) per year.[25] Rainfall is very unreliable and erratic in the Sahara as it may vary considerably year by year. In full contrast to the negligible annual rainfall amounts, the annual rates of potential evaporation are extraordinarily high, roughly ranging from 2,500 millimetres (100 in) per year to more than 6,000 millimetres (240 in) per year in the whole desert. Nowhere else on Earth has air been found as dry and evaporative as in the Sahara region. However, at least two instances of snowfall have been recorded in Sahara, in February 1979 and December 2016, both in the town of Ain Sefra.
Desertification and prehistoric climate
One theory for the formation of the Sahara is that the monsoon in Northern Africa was weakened because of glaciation during the Quaternary period, starting two or three million years ago. Another theory is that the monsoon was weakened when the ancient Tethys Sea dried up during the Tortonian period around 7 million years ago.
The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years, believed to be caused by long-term changes in the North African climate cycle that alters the path of the North African Monsoon – usually southward. The cycle is caused by a 41,000-year cycle in which the tilt of the earth changes between 22° and 24.5°. At present, we are in a dry period, but it is expected that the Sahara will become green again in 15,000 years. When the North African monsoon is at its strongest, annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green Sahara". For a relatively weak North African monsoon, the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the "desert Sahara".
The idea that changes in insolation (solar heating) caused by long-term changes in Earth's orbit are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century, The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. Kutzbach's ideas about the impacts of insolation on global monsoonal patterns have become widely accepted today as the underlying driver of long-term monsoonal cycles. Kutzbach never formally named his hypothesis and as such it is referred to here as the "Orbital Monsoon Hypothesis" as suggested by Ruddiman in 2001.
During the last glacial period, the Sahara was much larger than it is today, extending south beyond its current boundaries. The end of the glacial period brought more rain to the Sahara, from about 8000 BCE to 6000 BCE, perhaps because of low pressure areas over the collapsing ice sheets to the north. Once the ice sheets were gone, the northern Sahara dried out. In the southern Sahara, the drying trend was initially counteracted by the monsoon, which brought rain further north than it does today. By around 4200 BCE, however, the monsoon retreated south to approximately where it is today, leading to the gradual desertification of the Sahara. The Sahara is now as dry as it was about 13,000 years ago.
Lake Chad is the remnant of a former inland sea, paleolake Mega-Chad, which existed during the African humid period. At its largest extent, sometime before 5000 BCE, Lake Mega-Chad was the largest of four Saharan paleolakes, and is estimated to have covered an area of 350,000 km2.
The Sahara pump theory describes this cycle. During periods of a wet or "Green Sahara", the Sahara becomes a savanna grassland and various flora and fauna become more common. Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains, southwards into West Africa, or eastwards into the Nile Valley. This separates populations of some of the species in areas with different climates, forcing them to adapt, possibly giving rise to allopatric speciation.
September 2020, it was reported that the GGW had only covered 4% of the planned area.
It is also proposed that humans accelerated the drying-out period from 6000 to 2500 BCE by pastoralists overgrazing available grassland.
Evidence for cycles
The growth of speleothems (which requires rainwater) was detected in Hol-Zakh, Ashalim, Even-Sid, Ma'ale-ha-Meyshar, Ktora Cracks, Nagev Tzavoa Cave, and elsewhere, and has allowed tracking of prehistoric rainfall. The Red Sea coastal route was extremely arid before 140 and after 115 kya (thousands of years ago). Slightly wetter conditions appear at 90–87 kya, but it still was just one tenth the rainfall around 125 kya. In the southern Negev Desert speleothems did not grow between 185 and 140 kya (MIS 6), 110–90 (MIS 5.4–5.2), nor after 85 kya nor during most of the interglacial period (MIS 5.1), the glacial period and Holocene. This suggests that the southern Negev was arid-to-hyper-arid in these periods.
During the Last Glacial Maximum (LGM) the Sahara was more extensive than it is now with the extent of the tropical forests being greatly reduced, and the lower temperatures reduced the strength of the Hadley Cell. This is a climate cell which causes rising tropical air of the Inter-Tropical Convergence Zone (ITCZ) to bring rain to the tropics, while dry descending air, at about 20 degrees north, flows back to the equator and brings desert conditions to this region. It is associated with high rates of wind-blown mineral dust, and these dust levels are found as expected in marine cores from the north tropical Atlantic. But around 12,500 BCE the amount of dust in the cores in the Bølling/Allerød phase suddenly plummets and shows a period of much wetter conditions in the Sahara, indicating a Dansgaard-Oeschger (DO) event (a sudden warming followed by a slower cooling of the climate). The moister Saharan conditions had begun about 12,500 BCE, with the extension of the ITCZ northward in the northern hemisphere summer, bringing moist wet conditions and a savanna climate to the Sahara, which (apart from a short dry spell associated with the Younger Dryas) peaked during the Holocene thermal maximum climatic phase at 4000 BCE when mid-latitude temperatures seem to have been between 2 and 3 degrees warmer than in the recent past. Analysis of Nile River deposited sediments in the delta also shows this period had a higher proportion of sediments coming from the Blue Nile, suggesting higher rainfall also in the Ethiopian Highlands. This was caused principally by a stronger monsoonal circulation throughout the sub-tropical regions, affecting India, Arabia and the Sahara.[citation needed] Lake Victoria only recently became the source of the White Nile and dried out almost completely around 15 kya.
The sudden subsequent movement of the ITCZ southwards with a Heinrich event (a sudden cooling followed by a slower warming), linked to changes with the El Niño-Southern Oscillation cycle, led to a rapid drying out of the Saharan and Arabian regions, which quickly became desert. This is linked to a marked decline in the scale of the Nile floods between 2700 and 2100 BCE.
Ecoregions
The Sahara comprises several distinct ecoregions. With their variations in temperature, rainfall, elevation, and soil, these regions harbor distinct communities of plants and animals.
The Atlantic coastal desert is a narrow strip along the Atlantic coast where fog generated offshore by the cool Canary Current provides sufficient moisture to sustain a variety of lichens, succulents, and shrubs. It covers an area of 39,900 square kilometers (15,400 sq mi) in the south of Morocco and Mauritania.
The North Saharan steppe and woodlands is along the northern desert, next to the Mediterranean forests, woodlands, and scrub ecoregions of the northern Maghreb and Cyrenaica. Winter rains sustain shrublands and dry woodlands that form a transition between the Mediterranean climate regions to the north and the hyper-arid Sahara proper to the south. It covers 1,675,300 square kilometers (646,840 sq mi) in Algeria, Egypt, Libya, Mauritania, Morocco, and Tunisia.
The Sahara desert ecoregion covers the hyper-arid central portion of the Sahara where rainfall is minimal and sporadic. Vegetation is rare, and this ecoregion consists mostly of sand dunes (erg, chech, raoui), stone plateaus (hamadas), gravel plains (reg), dry valleys (wadis), and salt flats. It covers 4,639,900 square kilometres (1,791,500 sq mi) of: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, and Sudan.
The South Saharan steppe and woodlands ecoregion is a narrow band running east and west between the hyper-arid Sahara and the Sahel savannas to the south. Movements of the equatorial Intertropical Convergence Zone (ITCZ) bring summer rains during July and August which average 100 to 200 mm (4 to 8 in) but vary greatly from year to year. These rains sustain summer pastures of grasses and herbs, with dry woodlands and shrublands along seasonal watercourses. This ecoregion covers 1,101,700 square kilometres (425,400 sq mi) in Algeria, Chad, Mali, Mauritania, and Sudan.
In the West Saharan montane xeric woodlands, several volcanic highlands provide a cooler, moister environment that supports Saharo-Mediterranean woodlands and shrublands. The ecoregion covers 258,100 square kilometres (99,650 sq mi), mostly in the Tassili n'Ajjer of Algeria, with smaller enclaves in the Aïr of Niger, the Adrar Plateau of Mauritania, and the Adrar des Iforas of Mali and Algeria.
The Tibesti-Jebel Uweinat montane xeric woodlands ecoregion consists of the Tibesti and Jebel Uweinat highlands. Higher and more regular rainfall and cooler temperatures support woodlands and shrublands of date palm, acacias, myrtle, oleander, tamarix, and several rare and endemic plants. The ecoregion covers 82,200 square kilometres (31,700 sq mi) in the Tibesti of Chad and Libya, and Jebel Uweinat on the border of Egypt, Libya, and Sudan.
The Saharan halophytics is an area of seasonally flooded saline depressions which is home to halophytic (salt-adapted) plant communities. The Saharan halophytics cover 54,000 square kilometres (21,000 sq mi) including: the Qattara and Siwa depressions in northern Egypt, the Tunisian salt lakes of central Tunisia, Chott Melghir in Algeria, and smaller areas of Algeria, Mauritania, and the southern part of Morocco.
The Tanezrouft is one of the Sahara's most arid regions, with no vegetation and very little life. A barren, flat gravel plain, it extends south of Reggane in Algeria towards the Adrar des Ifoghas highlands in northern Mali.
Flora and fauna
The flora of the Sahara is highly diversified based on the bio-geographical characteristics of this vast desert. Floristically, the Sahara has three zones based on the amount of rainfall received – the Northern (Mediterranean), Central and Southern Zones. There are two transitional zones – the Mediterranean-Sahara transition and the Sahel transition zone.
The Saharan flora comprises around 2800 species of vascular plants. Approximately a quarter of these are endemic. About half of these species are common to the flora of the Arabian deserts.
The central Sahara is estimated to include five hundred species of plants, which is extremely low considering the huge extent of the area. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture, and by having small thick leaves or needles to prevent water loss by evapotranspiration. Plant leaves may dry out totally and then recover.
Several species of fox live in the Sahara including: the fennec fox, pale fox and Rüppell's fox. The addax, a large white antelope, can go nearly a year in the desert without drinking. The dorcas gazelle is a north African gazelle that can also go for a long time without water. Other notable gazelles include the rhim gazelle and dama gazelle.
The Saharan cheetah (northwest African cheetah) lives in Algeria, Togo, Niger, Mali, Benin, and Burkina Faso. There remain fewer than 250 mature cheetahs, which are very cautious, fleeing any human presence. The cheetah avoids the sun from April to October, seeking the shelter of shrubs such as balanites and acacias. They are unusually pale. The other cheetah subspecies (northeast African cheetah) lives in Chad, Sudan and the eastern region of Niger. However, it is currently extinct in the wild in Egypt and Libya. There are approximately 2000 mature individuals left in the wild.
Other animals include the monitor lizards, hyrax, sand vipers, and small populations of African wild dog, in perhaps only 14 countries and red-necked ostrich. Other animals exist in the Sahara (birds in particular) such as African silverbill and black-faced firefinch, among others. There are also small desert crocodiles in Mauritania and the Ennedi Plateau of Chad.
The deathstalker scorpion can be 10 cm (3.9 in) long. Its venom contains large amounts of agitoxin and scyllatoxin and is very dangerous; however, a sting from this scorpion rarely kills a healthy adult. The Saharan silver ant is unique in that due to the extreme high temperatures of their habitat, and the threat of predators, the ants are active outside their nest for only about ten minutes per day.
Dromedary camels and goats are the domesticated animals most commonly found in the Sahara. Because of its qualities of endurance and speed, the dromedary is the favourite animal used by nomads.
Human activities are more likely to affect the habitat in areas of permanent water (oases) or where water comes close to the surface. Here, the local pressure on natural resources can be intense. The remaining populations of large mammals have been greatly reduced by hunting for food and recreation. In recent years development projects have started in the deserts of Algeria and Tunisia using irrigated water pumped from underground aquifers. These schemes often lead to soil degradation and salinization.
Researchers from Hacettepe University have reported that Saharan soil may have bio-available iron and also some essential macro and micro nutrient elements suitable for use as fertilizer for growing wheat.
History
People lived on the edge of the desert thousands of years ago, since the end of the last glacial period. In the Central Sahara, engraved and painted rock art were created perhaps as early as 10,000 years ago, spanning the Bubaline Period, Kel Essuf Period, Round Head Period, Pastoral Period, Caballine Period, and Cameline Period. The Sahara was then a much wetter place than it is today. Over 30,000 petroglyphs of river animals such as crocodiles survive, with half found in the Tassili n'Ajjer in southeast Algeria. Fossils of dinosaurs, including Afrovenator, Jobaria and Ouranosaurus, have also been found here. The modern Sahara, though, is not lush in vegetation, except in the Nile Valley, at a few oases, and in the northern highlands, where Mediterranean plants such as the olive tree are found to grow. Shifts in Earth's axis increased temperatures and decreased precipitation, which caused an abrupt beginning of North Africa desertification about 5,400 years ago.
Kiffians
The Kiffian culture is a prehistoric industry, or domain, that existed between 10,000 and 8,000 years ago in the Sahara, during the Neolithic Subpluvial. Human remains from this culture were found in 2000 at a site known as Gobero, located in Niger in the Ténéré Desert. The site is known as the largest and earliest grave of Stone Age people in the Sahara. The Kiffians were skilled hunters. Bones of many large savannah animals that were discovered in the same area suggest that they lived on the shores of a lake that was present during the Holocene Wet Phase, a period when the Sahara was verdant and wet. The Kiffian people were tall, standing over six feet in height. Craniometric analysis indicates that this early Holocene population was closely related to the Late Pleistocene Iberomaurusians and early Holocene Capsians of the Maghreb, as well as mid-Holocene Mechta groups. Traces of the Kiffian culture do not exist after 8,000 years ago, as the Sahara went through a dry period for the next thousand years. After this time, the Tenerian culture colonized the area.
Tenerians
Gobero was discovered in 2000 during an archaeological expedition led by Paul Sereno, which sought dinosaur remains. Two distinct prehistoric cultures were discovered at the site: the early Holocene Kiffian culture, and the middle Holocene Tenerian culture. The post-Kiffian desiccation lasted until around 4600 BCE, when the earliest artefacts associated with the Tenerians have been dated to. Some 200 skeletons have been discovered at Gobero. The Tenerians were considerably shorter in height and less robust than the earlier Kiffians. Craniometric analysis also indicates that they were osteologically distinct. The Kiffian skulls are akin to those of the Late Pleistocene Iberomaurusians, early Holocene Capsians, and mid-Holocene Mechta groups, whereas the Tenerian crania are more like those of Mediterranean groups. Graves show that the Tenerians observed spiritual traditions, as they were buried with artifacts such as jewelry made of hippo tusks and clay pots. The most interesting find is a triple burial, dated to 5300 years ago, of an adult female and two children, estimated through their teeth as being five and eight years old, hugging each other. Pollen residue indicates they were buried on a bed of flowers. The three are assumed to have died within 24 hours of each other, but as their skeletons hold no apparent trauma (they did not die violently) and they have been buried so elaborately – unlikely if they had died of a plague – the cause of their deaths is a mystery.
Tashwinat Mummy
Uan Muhuggiag appears to have been inhabited from at least the 6th millennium BCE to about 2700 BCE, although not necessarily continuously. The most noteworthy find at Uan Muhuggiag is the well-preserved mummy of a young boy of approximately 2+1⁄2 years old. The child was in a fetal position, then embalmed, then placed in a sack made of antelope skin, which was insulated by a layer of leaves. The boy's organs were removed, as evidenced by incisions in his stomach and thorax, and an organic preservative was inserted to stop his body from decomposing. An ostrich eggshell necklace was also found around his neck. Radiocarbon dating determined the age of the mummy to be approximately 5600 years old, which makes it about 1000 years older than the earliest previously recorded mummy in ancient Egypt. In 1958–59, an archaeological expedition led by Antonio Ascenzi conducted anthropological, radiological, histological and chemical analyses on the Uan Muhuggiag mummy. The team claimed that the mummy was a 30-month-old child of uncertain sex. They also found a long incision on the specimen's abdominal wall, which indicated that the body had been initially mummified by evisceration and later underwent natural desiccation. The team also stated that the mummy possessed "Negroid features." However, modern genetics has since proven that the final claim is unscientific and not supported by evidence. A more recent publication referenced a laboratory examination of the cutaneous features of the child mummy in which the results verified that the child possessed a dark skin complexion. One other individual, an adult, was found at Uan Muhuggiag, buried in a crouched position. However, the body showed no evidence of evisceration or any other method of preservation. The body was estimated to date from about 7500 BP.
Nubians
During the Neolithic Era, before the onset of desertification around 9500 BCE, the central Sudan had been a rich environment supporting a large population ranging across what is now barren desert, like the Wadi el-Qa'ab. By the 5th millennium BCE, the people who inhabited what is now called Nubia were full participants in the "agricultural revolution", living a settled lifestyle with domesticated plants and animals. Saharan rock art of cattle and herdsmen suggests the presence of a cattle cult like those found in Sudan and other pastoral societies in Africa today. Megaliths found at Nabta Playa are overt examples of probably the world's first known archaeoastronomy devices, predating Stonehenge by some 2,000 years. This complexity, as observed at Nabta Playa, and as expressed by different levels of authority within the society there, likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt. Archaeological evidence has attested that population settlements occurred in Nubia as early as the Late Pleistocene era and from the 5th millennium BC onwards, whereas there is "no or scanty evidence" of human presence in the Egyptian Nile Valley during these periods, which may be due to problems in site preservation.
Egyptians
By 6000 BCE predynastic Egyptians in the southwestern corner of Egypt were herding cattle and constructing large buildings. Subsistence in organized and permanent settlements in predynastic Egypt by the middle of the 6th millennium BCE centered predominantly on cereal and animal agriculture: cattle, goats, pigs and sheep. Metal objects replaced prior ones of stone. Tanning of animal skins, pottery and weaving were commonplace in this era also. There are indications of seasonal or only temporary occupation of the Al Fayyum in the 6th millennium BCE, with food activities centering on fishing, hunting and food-gathering. Stone arrowheads, knives and scrapers from the era are commonly found. Burial items included pottery, jewelry, farming and hunting equipment, and assorted foods including dried meat and fruit. Burial in desert environments appears to enhance Egyptian preservation rites, and the dead were buried facing due west. Several scholars have argued that the African origins of the Egyptian civilisation derived from pastoral communities which emerged in both the Egyptian and Sudanese regions of the Nile Valley in the fifth millennium BCE.
By 3400 BCE, the Sahara was as dry as it is today, due to reduced precipitation and higher temperatures resulting from a shift in Earth's orbit. As a result of this aridification, it became a largely impenetrable barrier to humans, with the remaining settlements mainly being concentrated around the numerous oases that dot the landscape. Little trade or commerce is known to have passed through the interior in subsequent periods, the only major exception being the Nile Valley. The Nile, however, was impassable at several cataracts, making trade and contact by boat difficult.
Tichitt culture
In 4000 BCE, the start of sophisticated social structure (e.g., trade of cattle as valued assets) developed among herders amid the Pastoral Period of the Sahara. Saharan pastoral culture (e.g., fields of tumuli, lustrous stone rings, axes) was intricate. By 1800 BCE, Saharan pastoral culture expanded throughout the Saharan and Sahelian regions. The initial stages of sophisticated social structure among Saharan herders served as the segue for the development of sophisticated hierarchies found in African settlements, such as Dhar Tichitt. After migrating from the Central Sahara, proto-Mande peoples established their civilization in the Tichitt region of the Western Sahara[88] The Tichitt Tradition of eastern Mauritania dates from 2200 BCE[89][90] to 200 BCE. Tichitt culture, at Dhar Néma, Dhar Tagant, Dhar Tichitt, and Dhar Walata, included a four-tiered hierarchal social structure, farming of cereals, metallurgy, numerous funerary tombs, and a rock art tradition At Dhar Tichitt and Dhar Walata, pearl millet may have also been independently tamed amid the Neolithic. Dhar Tichitt, which includes Dakhlet el Atrouss, may have served as the primary regional center for the multi-tiered hierarchical social structure of the Tichitt Tradition, and the Malian Lakes Region, which includes Tondidarou, may have served as a second regional center of the Tichitt Tradition. The urban Tichitt Tradition may have been the earliest large-scale, complexly organized society in West Africa, and an early civilization of the Sahara, which may have served as the segue for state formation in West Africa.
As areas where the Tichitt cultural tradition were present, Dhar Tichitt and Dhar Walata were occupied more frequently than Dhar Néma. Farming of crops (e.g., millet) may have been a feature of the Tichitt cultural tradition as early as 3rd millennium BCE in Dhar Tichitt.
As part of a broader trend of iron metallurgy developed in the West African Sahel amid 1st millennium BCE, iron items (350 BCE – 100 CE) were found at Dhar Tagant, iron metalworking and/or items (800 BCE – 400 BCE) were found at Dia Shoma and Walaldé, and the iron remnants (760 BCE – 400 BCE) found at Bou Khzama and Djiganyai. The iron materials that were found are evidence of iron metalworking at Dhar Tagant. In the late period of the Tichitt Tradition at Dhar Néma, tamed pearl millet was used to temper the tuyeres of a oval-shaped low shaft furnace; this furnace was one out of 16 iron furnaces located on elevated ground. Iron metallurgy may have developed before the second half of 1st millennium BCE, as indicated by pottery dated between 800 BCE and 200 BCE. At Dhar Walata and Dhar Tichitt, copper was also used.
After its decline in Mauritania, the Tichitt Tradition spread to the Middle Niger region (e.g., Méma, Macina, Dia Shoma, Jenne Jeno) of Mali where it developed into and persisted as Faïta Facies ceramics between 1300 BCE and 400 BCE among rammed earth architecture and iron metallurgy (which had developed after 900 BCE). Thereafter, the Ghana Empire developed in the 1st millennium CE.
Phoenicians
The people of Phoenicia, who flourished from 1200 to 800 BCE, created a chain of settlements along the coast of North Africa and traded extensively with its inhabitants. This put them in contact with the people of ancient Libya, who were the ancestors of people who speak Berber languages in North Africa and the Sahara today.
The Libyco-Berber alphabet of the ancient Libyans of north Africa seems to have been based on Phoenician, and its descendant Tifinagh is still used today by the (Berber) Tuareg of the central Sahara.
The Periplus of the Phoenician navigator Hanno, who lived sometime in the 5th century BC, claims that he founded settlements along the Atlantic coast of Africa, possibly including the Western Sahara. The identification of the places discussed is controversial, and archeological confirmation is lacking.
Greeks
By 500 BCE, Greeks arrived in the desert. Greek traders spread along the eastern coast of the desert, establishing trading colonies along the Red Sea. The Carthaginians explored the Atlantic coast of the desert, but the turbulence of the waters and the lack of markets caused a lack of presence further south than modern Morocco. Centralized states thus surrounded the desert on the north and east; it remained outside the control of these states. Raids from the nomadic Berber people of the desert were of constant concern to those living on the edge of the desert.
Garamantes
An urban civilization, the Garamantes, arose around 500 BCE in the heart of the Sahara, in a valley that is now called the Wadi al-Ajal in Fezzan, Libya. The Garamantes built a prosperous empire in the heart of the desert. The Garamantes achieved this development by digging tunnels far into the mountains flanking the valley to tap fossil water and bring it to their fields. The Garamantes grew populous and strong, conquering their neighbors, and capturing and enslaving many individuals who were forced to work by extending the tunnels. The ancient Greeks and the Romans knew of the Garamantes and regarded them as uncivilized nomads. However, they traded with them, and a Roman bath has been found in the Garamantes' capital of Garama. Archaeologists have found eight major towns and many other important settlements in the Garamantes' territory. The Garamantes' civilization eventually collapsed after they had depleted available water in the aquifers and could no longer sustain the effort to extend the tunnels further into the mountains.
Between the first century BCE and the fourth century CE, several Roman expeditions into the Sahara were conducted by groups of military and commercial units of Romans.
Islamic and Arabic expansion
Main articles: Trans-Saharan trade and Islamization of Sudan
The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia, specifically the Arabian peninsula, the Muslim conquest of North Africa began in the mid-7th to early 8th centuries and Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. Trade across the desert intensified, and a significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
The Beni Ḥassān and other nomadic Arab tribes dominated the Sanhaja Berber tribes of the western Sahara after the Char Bouba war of the 17th century. As a result, Arabian culture and language came to dominate, and the Berber tribes underwent some Arabization.
Ottoman Turkish era
In the 16th century the northern fringe of the Sahara, such as coastal regencies in present-day Algeria and Tunisia, as well as some parts of present-day Libya, together with the semi-autonomous kingdom of Egypt, were occupied by the Ottoman Empire. From 1517 Egypt was a valued part of the Ottoman Empire, ownership of which provided the Ottomans with control over the Nile Valley, the east Mediterranean and North Africa. The benefit of the Ottoman Empire was the freedom of movement for citizens and goods. Traders exploited the Ottoman land routes to handle the spices, gold and silk from the East, manufactured goods from Europe, and the slave and gold traffic from Africa. Arabic continued as the local language and Islamic culture was much reinforced. The Sahel and southern Sahara regions were home to several independent states or to roaming Tuareg clans.
European colonialism
European colonialism in the Sahara began in the 19th century. France conquered the regency of Algiers from the Ottomans in 1830, and French rule spread south from French Algeria and eastwards from Senegal into the upper Niger to include present-day Algeria, Chad, Mali then French Sudan including Timbuktu (1893), Mauritania, Morocco (1912), Niger, and Tunisia (1881). By the beginning of the 20th century, the trans-Saharan trade had clearly declined because goods were moved through more modern and efficient means, such as airplanes, rather than across the desert.
The French took advantage of long-standing animosity between the Chaamba Arabs and the Tuareg. The newly raised Méhariste camel corps were originally recruited mainly from the Chaamba nomadic tribe. In 1902, the French penetrated the Hoggar mountains and defeated Ahaggar Tuareg in the battle of Tit.
The French Colonial Empire was the dominant presence in the Sahara. It established regular air links from Toulouse (HQ of famed Aéropostale), to Oran and over the Hoggar to Timbuktu and West to Bamako and Dakar, as well as trans-Sahara bus services run by La Compagnie Transsaharienne (est. 1927). A remarkable film shot by famous aviator Captain René Wauthier in 1933 documents the first crossing by a large truck convoy from Algiers to Tchad, across the Sahara.
Egypt, under Muhammad Ali and his successors, conquered Nubia in 1820–22, founded Khartoum in 1823, and conquered Darfur in 1874. Egypt, including Sudan, became a British protectorate in 1882. Egypt and Britain lost control of the Sudan from 1882 to 1898 as a result of the Mahdist War. After its capture by British troops in 1898, the Sudan became an Anglo-Egyptian condominium.
Spain captured present-day Western Sahara after 1874, although Rio del Oro remained largely under Sahrawi influence. In 1912, Italy captured parts of what was to be named Libya from the Ottomans. To promote the Roman Catholic religion in the desert, Pope Pius IX appointed a delegate Apostolic of the Sahara and the Sudan in 1868; later in the 19th century his jurisdiction was reorganized into the Vicariate Apostolic of Sahara.
Egypt became independent of Britain in 1936, although the Anglo-Egyptian treaty of 1936 allowed Britain to keep troops in Egypt and to maintain the British-Egyptian condominium in the Sudan. British military forces were withdrawn in 1954.
Most of the Saharan states achieved independence after World War II: Libya in 1951; Morocco, Sudan, and Tunisia in 1956; Chad, Mali, Mauritania, and Niger in 1960; and Algeria in 1962. Spain withdrew from Western Sahara in 1975, and it was partitioned between Mauritania and Morocco. Mauritania withdrew in 1979; Morocco continues to hold the territory (see Western Sahara conflict).
Tuareg people in Mali rebelled several times during the 20th century before finally forcing the Malian armed forces to withdraw below the line demarcating Azawad from southern Mali during the 2012 rebellion. Islamist rebels in the Sahara calling themselves al-Qaeda in the Islamic Maghreb have stepped up their violence in recent years.
In the post–World War II era, several mines and communities have developed to use the desert's natural resources. These include large deposits of oil and natural gas in Algeria and Libya, and large deposits of phosphates in Morocco and Western Sahara. Libya's Great Man-Made River is the world's largest irrigation project. The project uses a pipeline system that pumps fossil water from the Nubian Sandstone Aquifer System to cities in the populous Libyan northern Mediterranean coast including Tripoli and Benghazi.
A number of Trans-African highways have been proposed across the Sahara, including the Cairo–Dakar Highway along the Atlantic coast, the Trans-Sahara Highway from Algiers on the Mediterranean to Kano in Nigeria, the Tripoli – Cape Town Highway from Tripoli in Libya to N'Djamena in Chad, and the Cairo – Cape Town Highway which follows the Nile. Each of these highways is partially complete, with significant gaps and unpaved sections.
People, culture, and languages
A 19th-century engraving of an Arab slave-trading caravan transporting black African slaves across the Sahara
The people of the Sahara are of various origins. Among them the Amazigh including the Tuareg, various Arabized Amaziɣ groups such as the Hassaniya-speaking Sahrawis, whose populations include the Znaga, a tribe whose name is a remnant of the pre-historic Zenaga language. Other major groups of people include the: Toubou, Nubians, Zaghawa, Kanuri, Hausa, Songhai, Beja, and Fula/Fulani (French: Peul; Fula: Fulɓe). The archaeological evidence from the Holocene period has shown that Nilo-Saharan speaking groups had populated the central and southern Sahara before the influx of Berber and Arabic speakers, around 1500 years ago, who now largely populate the Sahara in the modern era.
Arabic dialects are the most widely spoken languages in the Sahara. Arabic, Berber and its variants now regrouped under the term Amazigh (which includes the Guanche language spoken by the original Berber inhabitants of the Canary Islands) and Beja languages are part of the Afro-Asiatic or Hamito-Semitic family.[citation needed] Unlike neighboring West Africa and the central governments of the states that comprise the Sahara, the French language bears little relevance to inter-personal discourse and commerce within the region, its people retaining staunch ethnic and political affiliations with Tuareg and Berber leaders and culture. The legacy of the French colonial era administration is primarily manifested in the territorial reorganization enacted by the Third and Fourth republics, which engendered artificial political divisions within a hitherto isolated and porous region.[113] Diplomacy with local clients was conducted primarily in Arabic, which was the traditional language of bureaucratic affairs. Mediation of disputes and inter-agency communication was served by interpreters contracted by the French government, who, according to Keenan, "documented a space of intercultural mediation," contributing much to preserving the indigenous cultural identities in the region.
Good morning, and Happy Sunday! It's -8°C (18°F) outside; the sun is trying to shine, but the clouds are moving in again. As you can see from today's photo, we received a couple of inches of light and fluffy snow overnight.
Today's mug is from Florida and is the first one that started my collection. We have so many wonderful memories from our visits to the Sunshine State.
I plan to get outside with my camera to capture the beauty of the new snowfall. Later, I'll put a big pot of soup on the stove for tonight's dinner.
What are your plans for today? Did you get snow as well?
Snow-Bound
Shut in from all the world without,
We sat the clean-winged hearth about,
Content to let the north-wind roar
In baffled rage at pane and door,
While the red logs before us beat
The frost-lined back with tropic heat;
And ever, when a louder blast
Shook beam and rafter as it passed,
The merrier up its roaring draught
The great throat of the chimney laughed.
~ John Greenleaf Whittier (1865)
As you might guess form the five photos I have posted this morning, it is back to the archives again. All are from sometime in 2016. Under each one, I will add the description that I wrote under other photos taken on the same trips.
"My thoughts continue to be with all the people of Fort McMurray, Alberta, who are being devastated by a massive wildfire at the moment. All 88,000 people were forced to flee the city, many leaving everything behind. Now, much-needed rain and cooler temperatures are helping.
"Monday, May 9, 2016, 7:28 AM - After a week of fighting a devastating wildfire that sent thousands of Fort McMurray residents fleeing, it seems firefighters have been holding the line -- and the weather has actually been cooperative." From The Weather Network.
www.theweathernetwork.com/news/articles/weather-factoring...
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These Prairie Crocuses are the first flowers to appear each spring, often appearing around the end of March and sometimes as early as mid-March. No wonder they need to wear their furry winter jackets : ) However, this year, after an incredibly mild winter, the first report I heard of was from 3rd March. On 13 April 2016, after a volunteer shift, I finally got as far as the usual place I go to when I want to find and photograph them. Unfortunately, I find them on a steep hillside, which is sometimes a bit windy, and my balance is never particularly good. So glad I went, though, as I was already almost six weeks 'late'. I also noticed a patch or two of small, white Phlox flowers and a single patch of small yellow flowers. Will have to remind myself of their name later today. Early cinquefoil?"
"This furry little perennial is actually not a crocus, which is in the Lily family; it’s really an anemone, in the Buttercup family."
plantwatch.naturealberta.ca/choose-your-plants/prairie-cr...
"The prairie crocus (Anemone patens), is the first plant to bloom on the prairie each year. The true harbinger of spring, its mauve, petal-like sepals dot the still drab prairie landscape, often before the last snow of winter has melted. By blooming so early, the crocus assures itself of the complete attention of available pollinators - small bees and other insects. Its seeds can then ripen by early June and if moisture is available they will germinate right away. If the prairie is too dry the seeds will go dormant, then germinate the following spring.
Tufts of much-divided leaves emerge once flowering is finished and the risk of severe frost is over, but still well before most other prairie plants.
The saucer-shaped construction of many spring flowers like the crocus, is no accident. Neither is the fuzzy centre of the crocus (composed of numerous yellow stamens and a tuft of greyish pistils - that become plumed fruit), nor its highly reflective petals. It all adds up to solar heating . . . Crocus Style!
The sunlight that reaches the crocus' shiny petals is reflected into the flower centre. This energy is bounced around between the stamens and pistils warming these vital reproductive parts of the flower. On a sunny day the temperature inside a crocus flower can be as much as 10 C (18 F) warmer than the temperature of the surrounding air. Not only does the dish shaped flower concentrate the sun's warmth, it tracks the sun across the sky, maximizing the length of time each day that it can stay warmer than the surrounding air." From naturenorth.com.
www.naturenorth.com/spring/flora/crocus/Prairie_Crocus2.html
Er zijn maar weinig plekken waar je en de Eifeltoren en een trein op de foto kan zetten. Vanaf Pont de Grenelle heb je zicht op de spoorbrug in over de Seine, Pont Rouelle welke een onderdeel is van RER lijn C.
Deze dag is ook op YouTube te zien!
The Colorado Railroad Museum in Golden held its 2023 Colorado Crossings event on the weekend of May 13-14, 2023. Southwest Colorado railroads were highlighted (notably the long-abandoned Rio Grande Southern and Denver & Rio Grande Western) with numerous locomotives and cars in operation. The highlight of the two-day event was a recreation of the RGS tour undertaken by legendary historians/photographers Lucius Beebe and Charles Clegg in 1946. It was an extraordinary weekend of steam, with both Rio Grande Southern 4-6-0 20 and Denver & Rio Grande Western 2-8-2 491 in operation, along with CRRM’s fleet of restored RGS “Galloping Goose” motor cars. A big thanks is due to Jeff Taylor and all of CRRM’s volunteers for making this an event for the ages.
The Sahara (/səˈhɑːrə/, /səˈhærə/) is a desert spanning across North Africa. With an area of 9,200,000 square kilometres (3,600,000 sq mi), it is the largest hot desert in the world and the third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic.
The name "Sahara" is derived from Arabic: صَحَارَى, romanized: ṣaḥārā /sˤaħaːraː/, a broken plural form of ṣaḥrā' (صَحْرَاء /sˤaħraːʔ/), meaning "desert".
The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and the Sudan.
It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.
For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 20,000-year cycle caused by the precession of Earth's axis (about 26,000 years) as it rotates around the Sun, which changes the location of the North African monsoon.
Geography
The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers 9 million square kilometres (3,500,000 sq mi), amounting to 31% of Africa. If all areas with a mean annual precipitation of less than 250 mm (9.8 in) were included, the Sahara would be 11 million square kilometres (4,200,000 sq mi). It is one of three distinct physiographic provinces of the African massive physiographic division. Sahara is so large and bright that, in theory, it could be detected from other stars as a surface feature of Earth, with near-current technology.
The Sahara is mainly rocky hamada (stone plateaus); ergs (sand seas – large areas covered with sand dunes) form only a minor part, but many of the sand dunes are over 180 metres (590 ft) high. Wind or rare rainfall shape the desert features: sand dunes, dune fields, sand seas, stone plateaus, gravel plains (reg), dry valleys (wadi), dry lakes (oued), and salt flats (shatt or chott). Unusual landforms include the Richat Structure in Mauritania.
Several deeply dissected mountains, many volcanic, rise from the desert, including the Aïr Mountains, Ahaggar Mountains, Saharan Atlas, Tibesti Mountains, Adrar des Iforas, and the Red Sea Hills. The highest peak in the Sahara is Emi Koussi, a shield volcano in the Tibesti range of northern Chad.
The central Sahara is hyperarid, with sparse vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub, with trees and taller shrubs in wadis, where moisture collects. In the central, hyperarid region, there are many subdivisions of the great desert: Tanezrouft, the Ténéré, the Libyan Desert, the Eastern Desert, the Nubian Desert and others. These extremely arid areas often receive no rain for years.
To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb, the Sahara borders the Mediterranean forest, woodland, and scrub eco-regions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White and geographer Robert Capot-Rey, the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto, a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The northern limit also corresponds to the 100 mm (3.9 in) isohyet of annual precipitation.
To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Important cities located in the Sahara include Nouakchott, the capital of Mauritania; Tamanrasset, Ouargla, Béchar, Hassi Messaoud, Ghardaïa, and El Oued in Algeria; Timbuktu in Mali; Agadez in Niger; Ghat in Libya; and Faya-Largeau in Chad.
Climate
The Sahara is the world's largest hot desert. It is located in the horse latitudes under the subtropical ridge, a significant belt of semi-permanent subtropical warm-core high pressure where the air from the upper troposphere usually descends, warming and drying the lower troposphere and preventing cloud formation.
The permanent absence of clouds allows unhindered light and thermal radiation. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal chance of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The subtropical ridge is the predominant factor that explains the hot desert climate (Köppen climate classification BWh) of this vast region. The descending airflow is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert: this is the sunniest, driest and the most nearly "rainless" place on the planet, rivaling the Atacama Desert, lying in Chile and Peru.
The rainfall inhibition and the dissipation of cloud cover are most accentuated over the eastern section of the Sahara rather than the western. The prevailing air mass lying above the Sahara is the continental tropical (cT) air mass, which is hot and dry. Hot, dry air masses primarily form over the North-African desert from the heating of the vast continental land area, and it affects the whole desert during most of the year. Because of this extreme heating process, a thermal low is usually noticed near the surface, and is the strongest and the most developed during the summertime. The Sahara High represents the eastern continental extension of the Azores High, centered over the North Atlantic Ocean. The subsidence of the Sahara High nearly reaches the ground during the coolest part of the year, while it is confined to the upper troposphere during the hottest periods.
The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by its geographical configuration and location. Indeed, the extreme aridity of the Sahara is not only explained by the subtropical high pressure: the Atlas Mountains of Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier, causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates.
The primary source of rain in the Sahara is the Intertropical Convergence Zone, a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and southern Sahara. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by: extremely low, unreliable, highly erratic rainfall; extremely high sunshine duration values; high temperatures year-round; negligible rates of relative humidity; a significant diurnal temperature variation; and extremely high levels of potential evaporation which are the highest recorded worldwide.
Temperature
The sky is usually clear above the desert, and the sunshine duration is extremely high everywhere in the Sahara. Most of the desert has more than 3,600 hours of bright sunshine per year (over 82% of daylight hours), and a wide area in the eastern part has over 4,000 hours of bright sunshine per year (over 91% of daylight hours). The highest values are very close to the theoretical maximum value. A value of 4300 hours (98%) of the time would be[clarification needed] recorded in Upper Egypt (Aswan, Luxor) and in the Nubian Desert (Wadi Halfa). The annual average direct solar irradiation is around 2,800 kWh/(m2 year) in the Great Desert. The Sahara has a huge potential for solar energy production.
The high position of the Sun, the extremely low relative humidity, and the lack of vegetation and rainfall make the Great Desert the hottest large region in the world, and the hottest place on Earth during summer in some spots. The average high temperature exceeds 38 to 40 °C (100.4 to 104.0 °F) during the hottest month nearly everywhere in the desert except at very high altitudes. The world's highest officially recorded average daily high temperature[clarification needed] was 47 °C (116.6 °F) in a remote desert town in the Algerian Desert called Bou Bernous, at an elevation of 378 metres (1,240 ft) above sea level, and only Death Valley, California rivals it.
Other hot spots in Algeria such as Adrar, Timimoun, In Salah, Ouallene, Aoulef, Reggane with an elevation between 200 and 400 metres (660 and 1,310 ft) above sea level get slightly lower summer average highs, around 46 °C (114.8 °F) during the hottest months of the year. Salah, well known in Algeria for its extreme heat, has average high temperatures of 43.8 °C (110.8 °F), 46.4 °C (115.5 °F), 45.5 °C (113.9 °F) and 41.9 °C (107.4 °F) in June, July, August and September respectively. There are even hotter spots in the Sahara, but they are located in extremely remote areas, especially in the Azalai, lying in northern Mali. The major part of the desert experiences around three to five months when the average high strictly[clarification needed] exceeds 40 °C (104 °F); while in the southern central part of the desert, there are up to six or seven months when the average high temperature strictly[clarification needed] exceeds 40 °C (104 °F). Some examples of this are Bilma, Niger and Faya-Largeau, Chad. The annual average daily temperature exceeds 20 °C (68 °F) everywhere and can approach 30 °C (86 °F) in the hottest regions year-round. However, most of the desert has a value in excess of 25 °C (77 °F).
Sand and ground temperatures are even more extreme. During daytime, the sand temperature is extremely high: it can easily reach 80 °C (176 °F) or more. A sand temperature of 83.5 °C (182.3 °F) has been recorded in Port Sudan. Ground temperatures of 72 °C (161.6 °F) have been recorded in the Adrar of Mauritania and a value of 75 °C (167 °F) has been measured in Borkou, northern Chad.
Due to lack of cloud cover and very low humidity, the desert usually has high diurnal temperature variations between days and nights. However, it is a myth that the nights are especially cold after extremely hot days in the Sahara.[citation needed] On average, nighttime temperatures tend to be 13–20 °C (23–36 °F) cooler than in the daytime. The smallest variations are found along the coastal regions due to high humidity and are often even lower than a 10 °C (18 °F) difference, while the largest variations are found in inland desert areas where the humidity is the lowest, mainly in the southern Sahara. Still, it is true that winter nights can be cold, as it can drop to the freezing point and even below, especially in high-elevation areas.[clarification needed] The frequency of subfreezing winter nights in the Sahara is strongly influenced by the North Atlantic Oscillation (NAO), with warmer winter temperatures during negative NAO events and cooler winters with more frosts when the NAO is positive. This is because the weaker clockwise flow around the eastern side of the subtropical anticyclone during negative NAO winters, although too dry to produce more than negligible precipitation, does reduce the flow of dry, cold air from higher latitudes of Eurasia into the Sahara significantly.
Precipitation
The average annual rainfall ranges from very low in the northern and southern fringes of the desert to nearly non-existent over the central and the eastern part. The thin northern fringe of the desert receives more winter cloudiness and rainfall due to the arrival of low pressure systems over the Mediterranean Sea along the polar front, although very attenuated by the rain shadow effects of the mountains and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Biskra, Algeria, and Ouarzazate, Morocco, are found in this zone. The southern fringe of the desert along the border with the Sahel receives summer cloudiness and rainfall due to the arrival of the Intertropical Convergence Zone from the south and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Timbuktu, Mali and Agadez, Niger are found in this zone.
The vast central hyper-arid core of the desert is virtually never affected by northerly or southerly atmospheric disturbances and permanently remains under the influence of the strongest anticyclonic weather regime, and the annual average rainfall can drop to less than 1 millimetre (0.04 in). In fact, most of the Sahara receives less than 20 millimetres (0.8 in). Of the 9,000,000 square kilometres (3,500,000 sq mi) of desert land in the Sahara, an area of about 2,800,000 square kilometres (1,100,000 sq mi) (about 31% of the total area) receives an annual average rainfall amount of 10 millimetres (0.4 in) or less, while some 1,500,000 square kilometres (580,000 sq mi) (about 17% of the total area) receives an average of 5 millimetres (0.2 in) or less.
The annual average rainfall is virtually zero over a wide area of some 1,000,000 square kilometres (390,000 sq mi) in the eastern Sahara comprising deserts of: Libya, Egypt and Sudan (Tazirbu, Kufra, Dakhla, Kharga, Farafra, Siwa, Asyut, Sohag, Luxor, Aswan, Abu Simbel, Wadi Halfa) where the long-term mean approximates 0.5 millimetres (0.02 in) per year.[25] Rainfall is very unreliable and erratic in the Sahara as it may vary considerably year by year. In full contrast to the negligible annual rainfall amounts, the annual rates of potential evaporation are extraordinarily high, roughly ranging from 2,500 millimetres (100 in) per year to more than 6,000 millimetres (240 in) per year in the whole desert. Nowhere else on Earth has air been found as dry and evaporative as in the Sahara region. However, at least two instances of snowfall have been recorded in Sahara, in February 1979 and December 2016, both in the town of Ain Sefra.
Desertification and prehistoric climate
One theory for the formation of the Sahara is that the monsoon in Northern Africa was weakened because of glaciation during the Quaternary period, starting two or three million years ago. Another theory is that the monsoon was weakened when the ancient Tethys Sea dried up during the Tortonian period around 7 million years ago.
The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years, believed to be caused by long-term changes in the North African climate cycle that alters the path of the North African Monsoon – usually southward. The cycle is caused by a 41,000-year cycle in which the tilt of the earth changes between 22° and 24.5°. At present, we are in a dry period, but it is expected that the Sahara will become green again in 15,000 years. When the North African monsoon is at its strongest, annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green Sahara". For a relatively weak North African monsoon, the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the "desert Sahara".
The idea that changes in insolation (solar heating) caused by long-term changes in Earth's orbit are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century, The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. Kutzbach's ideas about the impacts of insolation on global monsoonal patterns have become widely accepted today as the underlying driver of long-term monsoonal cycles. Kutzbach never formally named his hypothesis and as such it is referred to here as the "Orbital Monsoon Hypothesis" as suggested by Ruddiman in 2001.
During the last glacial period, the Sahara was much larger than it is today, extending south beyond its current boundaries. The end of the glacial period brought more rain to the Sahara, from about 8000 BCE to 6000 BCE, perhaps because of low pressure areas over the collapsing ice sheets to the north. Once the ice sheets were gone, the northern Sahara dried out. In the southern Sahara, the drying trend was initially counteracted by the monsoon, which brought rain further north than it does today. By around 4200 BCE, however, the monsoon retreated south to approximately where it is today, leading to the gradual desertification of the Sahara. The Sahara is now as dry as it was about 13,000 years ago.
Lake Chad is the remnant of a former inland sea, paleolake Mega-Chad, which existed during the African humid period. At its largest extent, sometime before 5000 BCE, Lake Mega-Chad was the largest of four Saharan paleolakes, and is estimated to have covered an area of 350,000 km2.
The Sahara pump theory describes this cycle. During periods of a wet or "Green Sahara", the Sahara becomes a savanna grassland and various flora and fauna become more common. Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains, southwards into West Africa, or eastwards into the Nile Valley. This separates populations of some of the species in areas with different climates, forcing them to adapt, possibly giving rise to allopatric speciation.
September 2020, it was reported that the GGW had only covered 4% of the planned area.
It is also proposed that humans accelerated the drying-out period from 6000 to 2500 BCE by pastoralists overgrazing available grassland.
Evidence for cycles
The growth of speleothems (which requires rainwater) was detected in Hol-Zakh, Ashalim, Even-Sid, Ma'ale-ha-Meyshar, Ktora Cracks, Nagev Tzavoa Cave, and elsewhere, and has allowed tracking of prehistoric rainfall. The Red Sea coastal route was extremely arid before 140 and after 115 kya (thousands of years ago). Slightly wetter conditions appear at 90–87 kya, but it still was just one tenth the rainfall around 125 kya. In the southern Negev Desert speleothems did not grow between 185 and 140 kya (MIS 6), 110–90 (MIS 5.4–5.2), nor after 85 kya nor during most of the interglacial period (MIS 5.1), the glacial period and Holocene. This suggests that the southern Negev was arid-to-hyper-arid in these periods.
During the Last Glacial Maximum (LGM) the Sahara was more extensive than it is now with the extent of the tropical forests being greatly reduced, and the lower temperatures reduced the strength of the Hadley Cell. This is a climate cell which causes rising tropical air of the Inter-Tropical Convergence Zone (ITCZ) to bring rain to the tropics, while dry descending air, at about 20 degrees north, flows back to the equator and brings desert conditions to this region. It is associated with high rates of wind-blown mineral dust, and these dust levels are found as expected in marine cores from the north tropical Atlantic. But around 12,500 BCE the amount of dust in the cores in the Bølling/Allerød phase suddenly plummets and shows a period of much wetter conditions in the Sahara, indicating a Dansgaard-Oeschger (DO) event (a sudden warming followed by a slower cooling of the climate). The moister Saharan conditions had begun about 12,500 BCE, with the extension of the ITCZ northward in the northern hemisphere summer, bringing moist wet conditions and a savanna climate to the Sahara, which (apart from a short dry spell associated with the Younger Dryas) peaked during the Holocene thermal maximum climatic phase at 4000 BCE when mid-latitude temperatures seem to have been between 2 and 3 degrees warmer than in the recent past. Analysis of Nile River deposited sediments in the delta also shows this period had a higher proportion of sediments coming from the Blue Nile, suggesting higher rainfall also in the Ethiopian Highlands. This was caused principally by a stronger monsoonal circulation throughout the sub-tropical regions, affecting India, Arabia and the Sahara.[citation needed] Lake Victoria only recently became the source of the White Nile and dried out almost completely around 15 kya.
The sudden subsequent movement of the ITCZ southwards with a Heinrich event (a sudden cooling followed by a slower warming), linked to changes with the El Niño-Southern Oscillation cycle, led to a rapid drying out of the Saharan and Arabian regions, which quickly became desert. This is linked to a marked decline in the scale of the Nile floods between 2700 and 2100 BCE.
Ecoregions
The Sahara comprises several distinct ecoregions. With their variations in temperature, rainfall, elevation, and soil, these regions harbor distinct communities of plants and animals.
The Atlantic coastal desert is a narrow strip along the Atlantic coast where fog generated offshore by the cool Canary Current provides sufficient moisture to sustain a variety of lichens, succulents, and shrubs. It covers an area of 39,900 square kilometers (15,400 sq mi) in the south of Morocco and Mauritania.
The North Saharan steppe and woodlands is along the northern desert, next to the Mediterranean forests, woodlands, and scrub ecoregions of the northern Maghreb and Cyrenaica. Winter rains sustain shrublands and dry woodlands that form a transition between the Mediterranean climate regions to the north and the hyper-arid Sahara proper to the south. It covers 1,675,300 square kilometers (646,840 sq mi) in Algeria, Egypt, Libya, Mauritania, Morocco, and Tunisia.
The Sahara desert ecoregion covers the hyper-arid central portion of the Sahara where rainfall is minimal and sporadic. Vegetation is rare, and this ecoregion consists mostly of sand dunes (erg, chech, raoui), stone plateaus (hamadas), gravel plains (reg), dry valleys (wadis), and salt flats. It covers 4,639,900 square kilometres (1,791,500 sq mi) of: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, and Sudan.
The South Saharan steppe and woodlands ecoregion is a narrow band running east and west between the hyper-arid Sahara and the Sahel savannas to the south. Movements of the equatorial Intertropical Convergence Zone (ITCZ) bring summer rains during July and August which average 100 to 200 mm (4 to 8 in) but vary greatly from year to year. These rains sustain summer pastures of grasses and herbs, with dry woodlands and shrublands along seasonal watercourses. This ecoregion covers 1,101,700 square kilometres (425,400 sq mi) in Algeria, Chad, Mali, Mauritania, and Sudan.
In the West Saharan montane xeric woodlands, several volcanic highlands provide a cooler, moister environment that supports Saharo-Mediterranean woodlands and shrublands. The ecoregion covers 258,100 square kilometres (99,650 sq mi), mostly in the Tassili n'Ajjer of Algeria, with smaller enclaves in the Aïr of Niger, the Adrar Plateau of Mauritania, and the Adrar des Iforas of Mali and Algeria.
The Tibesti-Jebel Uweinat montane xeric woodlands ecoregion consists of the Tibesti and Jebel Uweinat highlands. Higher and more regular rainfall and cooler temperatures support woodlands and shrublands of date palm, acacias, myrtle, oleander, tamarix, and several rare and endemic plants. The ecoregion covers 82,200 square kilometres (31,700 sq mi) in the Tibesti of Chad and Libya, and Jebel Uweinat on the border of Egypt, Libya, and Sudan.
The Saharan halophytics is an area of seasonally flooded saline depressions which is home to halophytic (salt-adapted) plant communities. The Saharan halophytics cover 54,000 square kilometres (21,000 sq mi) including: the Qattara and Siwa depressions in northern Egypt, the Tunisian salt lakes of central Tunisia, Chott Melghir in Algeria, and smaller areas of Algeria, Mauritania, and the southern part of Morocco.
The Tanezrouft is one of the Sahara's most arid regions, with no vegetation and very little life. A barren, flat gravel plain, it extends south of Reggane in Algeria towards the Adrar des Ifoghas highlands in northern Mali.
Flora and fauna
The flora of the Sahara is highly diversified based on the bio-geographical characteristics of this vast desert. Floristically, the Sahara has three zones based on the amount of rainfall received – the Northern (Mediterranean), Central and Southern Zones. There are two transitional zones – the Mediterranean-Sahara transition and the Sahel transition zone.
The Saharan flora comprises around 2800 species of vascular plants. Approximately a quarter of these are endemic. About half of these species are common to the flora of the Arabian deserts.
The central Sahara is estimated to include five hundred species of plants, which is extremely low considering the huge extent of the area. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture, and by having small thick leaves or needles to prevent water loss by evapotranspiration. Plant leaves may dry out totally and then recover.
Several species of fox live in the Sahara including: the fennec fox, pale fox and Rüppell's fox. The addax, a large white antelope, can go nearly a year in the desert without drinking. The dorcas gazelle is a north African gazelle that can also go for a long time without water. Other notable gazelles include the rhim gazelle and dama gazelle.
The Saharan cheetah (northwest African cheetah) lives in Algeria, Togo, Niger, Mali, Benin, and Burkina Faso. There remain fewer than 250 mature cheetahs, which are very cautious, fleeing any human presence. The cheetah avoids the sun from April to October, seeking the shelter of shrubs such as balanites and acacias. They are unusually pale. The other cheetah subspecies (northeast African cheetah) lives in Chad, Sudan and the eastern region of Niger. However, it is currently extinct in the wild in Egypt and Libya. There are approximately 2000 mature individuals left in the wild.
Other animals include the monitor lizards, hyrax, sand vipers, and small populations of African wild dog, in perhaps only 14 countries and red-necked ostrich. Other animals exist in the Sahara (birds in particular) such as African silverbill and black-faced firefinch, among others. There are also small desert crocodiles in Mauritania and the Ennedi Plateau of Chad.
The deathstalker scorpion can be 10 cm (3.9 in) long. Its venom contains large amounts of agitoxin and scyllatoxin and is very dangerous; however, a sting from this scorpion rarely kills a healthy adult. The Saharan silver ant is unique in that due to the extreme high temperatures of their habitat, and the threat of predators, the ants are active outside their nest for only about ten minutes per day.
Dromedary camels and goats are the domesticated animals most commonly found in the Sahara. Because of its qualities of endurance and speed, the dromedary is the favourite animal used by nomads.
Human activities are more likely to affect the habitat in areas of permanent water (oases) or where water comes close to the surface. Here, the local pressure on natural resources can be intense. The remaining populations of large mammals have been greatly reduced by hunting for food and recreation. In recent years development projects have started in the deserts of Algeria and Tunisia using irrigated water pumped from underground aquifers. These schemes often lead to soil degradation and salinization.
Researchers from Hacettepe University have reported that Saharan soil may have bio-available iron and also some essential macro and micro nutrient elements suitable for use as fertilizer for growing wheat.
History
People lived on the edge of the desert thousands of years ago, since the end of the last glacial period. In the Central Sahara, engraved and painted rock art were created perhaps as early as 10,000 years ago, spanning the Bubaline Period, Kel Essuf Period, Round Head Period, Pastoral Period, Caballine Period, and Cameline Period. The Sahara was then a much wetter place than it is today. Over 30,000 petroglyphs of river animals such as crocodiles survive, with half found in the Tassili n'Ajjer in southeast Algeria. Fossils of dinosaurs, including Afrovenator, Jobaria and Ouranosaurus, have also been found here. The modern Sahara, though, is not lush in vegetation, except in the Nile Valley, at a few oases, and in the northern highlands, where Mediterranean plants such as the olive tree are found to grow. Shifts in Earth's axis increased temperatures and decreased precipitation, which caused an abrupt beginning of North Africa desertification about 5,400 years ago.
Kiffians
The Kiffian culture is a prehistoric industry, or domain, that existed between 10,000 and 8,000 years ago in the Sahara, during the Neolithic Subpluvial. Human remains from this culture were found in 2000 at a site known as Gobero, located in Niger in the Ténéré Desert. The site is known as the largest and earliest grave of Stone Age people in the Sahara. The Kiffians were skilled hunters. Bones of many large savannah animals that were discovered in the same area suggest that they lived on the shores of a lake that was present during the Holocene Wet Phase, a period when the Sahara was verdant and wet. The Kiffian people were tall, standing over six feet in height. Craniometric analysis indicates that this early Holocene population was closely related to the Late Pleistocene Iberomaurusians and early Holocene Capsians of the Maghreb, as well as mid-Holocene Mechta groups. Traces of the Kiffian culture do not exist after 8,000 years ago, as the Sahara went through a dry period for the next thousand years. After this time, the Tenerian culture colonized the area.
Tenerians
Gobero was discovered in 2000 during an archaeological expedition led by Paul Sereno, which sought dinosaur remains. Two distinct prehistoric cultures were discovered at the site: the early Holocene Kiffian culture, and the middle Holocene Tenerian culture. The post-Kiffian desiccation lasted until around 4600 BCE, when the earliest artefacts associated with the Tenerians have been dated to. Some 200 skeletons have been discovered at Gobero. The Tenerians were considerably shorter in height and less robust than the earlier Kiffians. Craniometric analysis also indicates that they were osteologically distinct. The Kiffian skulls are akin to those of the Late Pleistocene Iberomaurusians, early Holocene Capsians, and mid-Holocene Mechta groups, whereas the Tenerian crania are more like those of Mediterranean groups. Graves show that the Tenerians observed spiritual traditions, as they were buried with artifacts such as jewelry made of hippo tusks and clay pots. The most interesting find is a triple burial, dated to 5300 years ago, of an adult female and two children, estimated through their teeth as being five and eight years old, hugging each other. Pollen residue indicates they were buried on a bed of flowers. The three are assumed to have died within 24 hours of each other, but as their skeletons hold no apparent trauma (they did not die violently) and they have been buried so elaborately – unlikely if they had died of a plague – the cause of their deaths is a mystery.
Tashwinat Mummy
Uan Muhuggiag appears to have been inhabited from at least the 6th millennium BCE to about 2700 BCE, although not necessarily continuously. The most noteworthy find at Uan Muhuggiag is the well-preserved mummy of a young boy of approximately 2+1⁄2 years old. The child was in a fetal position, then embalmed, then placed in a sack made of antelope skin, which was insulated by a layer of leaves. The boy's organs were removed, as evidenced by incisions in his stomach and thorax, and an organic preservative was inserted to stop his body from decomposing. An ostrich eggshell necklace was also found around his neck. Radiocarbon dating determined the age of the mummy to be approximately 5600 years old, which makes it about 1000 years older than the earliest previously recorded mummy in ancient Egypt. In 1958–59, an archaeological expedition led by Antonio Ascenzi conducted anthropological, radiological, histological and chemical analyses on the Uan Muhuggiag mummy. The team claimed that the mummy was a 30-month-old child of uncertain sex. They also found a long incision on the specimen's abdominal wall, which indicated that the body had been initially mummified by evisceration and later underwent natural desiccation. The team also stated that the mummy possessed "Negroid features." However, modern genetics has since proven that the final claim is unscientific and not supported by evidence. A more recent publication referenced a laboratory examination of the cutaneous features of the child mummy in which the results verified that the child possessed a dark skin complexion. One other individual, an adult, was found at Uan Muhuggiag, buried in a crouched position. However, the body showed no evidence of evisceration or any other method of preservation. The body was estimated to date from about 7500 BP.
Nubians
During the Neolithic Era, before the onset of desertification around 9500 BCE, the central Sudan had been a rich environment supporting a large population ranging across what is now barren desert, like the Wadi el-Qa'ab. By the 5th millennium BCE, the people who inhabited what is now called Nubia were full participants in the "agricultural revolution", living a settled lifestyle with domesticated plants and animals. Saharan rock art of cattle and herdsmen suggests the presence of a cattle cult like those found in Sudan and other pastoral societies in Africa today. Megaliths found at Nabta Playa are overt examples of probably the world's first known archaeoastronomy devices, predating Stonehenge by some 2,000 years. This complexity, as observed at Nabta Playa, and as expressed by different levels of authority within the society there, likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt. Archaeological evidence has attested that population settlements occurred in Nubia as early as the Late Pleistocene era and from the 5th millennium BC onwards, whereas there is "no or scanty evidence" of human presence in the Egyptian Nile Valley during these periods, which may be due to problems in site preservation.
Egyptians
By 6000 BCE predynastic Egyptians in the southwestern corner of Egypt were herding cattle and constructing large buildings. Subsistence in organized and permanent settlements in predynastic Egypt by the middle of the 6th millennium BCE centered predominantly on cereal and animal agriculture: cattle, goats, pigs and sheep. Metal objects replaced prior ones of stone. Tanning of animal skins, pottery and weaving were commonplace in this era also. There are indications of seasonal or only temporary occupation of the Al Fayyum in the 6th millennium BCE, with food activities centering on fishing, hunting and food-gathering. Stone arrowheads, knives and scrapers from the era are commonly found. Burial items included pottery, jewelry, farming and hunting equipment, and assorted foods including dried meat and fruit. Burial in desert environments appears to enhance Egyptian preservation rites, and the dead were buried facing due west. Several scholars have argued that the African origins of the Egyptian civilisation derived from pastoral communities which emerged in both the Egyptian and Sudanese regions of the Nile Valley in the fifth millennium BCE.
By 3400 BCE, the Sahara was as dry as it is today, due to reduced precipitation and higher temperatures resulting from a shift in Earth's orbit. As a result of this aridification, it became a largely impenetrable barrier to humans, with the remaining settlements mainly being concentrated around the numerous oases that dot the landscape. Little trade or commerce is known to have passed through the interior in subsequent periods, the only major exception being the Nile Valley. The Nile, however, was impassable at several cataracts, making trade and contact by boat difficult.
Tichitt culture
In 4000 BCE, the start of sophisticated social structure (e.g., trade of cattle as valued assets) developed among herders amid the Pastoral Period of the Sahara. Saharan pastoral culture (e.g., fields of tumuli, lustrous stone rings, axes) was intricate. By 1800 BCE, Saharan pastoral culture expanded throughout the Saharan and Sahelian regions. The initial stages of sophisticated social structure among Saharan herders served as the segue for the development of sophisticated hierarchies found in African settlements, such as Dhar Tichitt. After migrating from the Central Sahara, proto-Mande peoples established their civilization in the Tichitt region of the Western Sahara[88] The Tichitt Tradition of eastern Mauritania dates from 2200 BCE[89][90] to 200 BCE. Tichitt culture, at Dhar Néma, Dhar Tagant, Dhar Tichitt, and Dhar Walata, included a four-tiered hierarchal social structure, farming of cereals, metallurgy, numerous funerary tombs, and a rock art tradition At Dhar Tichitt and Dhar Walata, pearl millet may have also been independently tamed amid the Neolithic. Dhar Tichitt, which includes Dakhlet el Atrouss, may have served as the primary regional center for the multi-tiered hierarchical social structure of the Tichitt Tradition, and the Malian Lakes Region, which includes Tondidarou, may have served as a second regional center of the Tichitt Tradition. The urban Tichitt Tradition may have been the earliest large-scale, complexly organized society in West Africa, and an early civilization of the Sahara, which may have served as the segue for state formation in West Africa.
As areas where the Tichitt cultural tradition were present, Dhar Tichitt and Dhar Walata were occupied more frequently than Dhar Néma. Farming of crops (e.g., millet) may have been a feature of the Tichitt cultural tradition as early as 3rd millennium BCE in Dhar Tichitt.
As part of a broader trend of iron metallurgy developed in the West African Sahel amid 1st millennium BCE, iron items (350 BCE – 100 CE) were found at Dhar Tagant, iron metalworking and/or items (800 BCE – 400 BCE) were found at Dia Shoma and Walaldé, and the iron remnants (760 BCE – 400 BCE) found at Bou Khzama and Djiganyai. The iron materials that were found are evidence of iron metalworking at Dhar Tagant. In the late period of the Tichitt Tradition at Dhar Néma, tamed pearl millet was used to temper the tuyeres of a oval-shaped low shaft furnace; this furnace was one out of 16 iron furnaces located on elevated ground. Iron metallurgy may have developed before the second half of 1st millennium BCE, as indicated by pottery dated between 800 BCE and 200 BCE. At Dhar Walata and Dhar Tichitt, copper was also used.
After its decline in Mauritania, the Tichitt Tradition spread to the Middle Niger region (e.g., Méma, Macina, Dia Shoma, Jenne Jeno) of Mali where it developed into and persisted as Faïta Facies ceramics between 1300 BCE and 400 BCE among rammed earth architecture and iron metallurgy (which had developed after 900 BCE). Thereafter, the Ghana Empire developed in the 1st millennium CE.
Phoenicians
The people of Phoenicia, who flourished from 1200 to 800 BCE, created a chain of settlements along the coast of North Africa and traded extensively with its inhabitants. This put them in contact with the people of ancient Libya, who were the ancestors of people who speak Berber languages in North Africa and the Sahara today.
The Libyco-Berber alphabet of the ancient Libyans of north Africa seems to have been based on Phoenician, and its descendant Tifinagh is still used today by the (Berber) Tuareg of the central Sahara.
The Periplus of the Phoenician navigator Hanno, who lived sometime in the 5th century BC, claims that he founded settlements along the Atlantic coast of Africa, possibly including the Western Sahara. The identification of the places discussed is controversial, and archeological confirmation is lacking.
Greeks
By 500 BCE, Greeks arrived in the desert. Greek traders spread along the eastern coast of the desert, establishing trading colonies along the Red Sea. The Carthaginians explored the Atlantic coast of the desert, but the turbulence of the waters and the lack of markets caused a lack of presence further south than modern Morocco. Centralized states thus surrounded the desert on the north and east; it remained outside the control of these states. Raids from the nomadic Berber people of the desert were of constant concern to those living on the edge of the desert.
Garamantes
An urban civilization, the Garamantes, arose around 500 BCE in the heart of the Sahara, in a valley that is now called the Wadi al-Ajal in Fezzan, Libya. The Garamantes built a prosperous empire in the heart of the desert. The Garamantes achieved this development by digging tunnels far into the mountains flanking the valley to tap fossil water and bring it to their fields. The Garamantes grew populous and strong, conquering their neighbors, and capturing and enslaving many individuals who were forced to work by extending the tunnels. The ancient Greeks and the Romans knew of the Garamantes and regarded them as uncivilized nomads. However, they traded with them, and a Roman bath has been found in the Garamantes' capital of Garama. Archaeologists have found eight major towns and many other important settlements in the Garamantes' territory. The Garamantes' civilization eventually collapsed after they had depleted available water in the aquifers and could no longer sustain the effort to extend the tunnels further into the mountains.
Between the first century BCE and the fourth century CE, several Roman expeditions into the Sahara were conducted by groups of military and commercial units of Romans.
Islamic and Arabic expansion
Main articles: Trans-Saharan trade and Islamization of Sudan
The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia, specifically the Arabian peninsula, the Muslim conquest of North Africa began in the mid-7th to early 8th centuries and Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. Trade across the desert intensified, and a significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
The Beni Ḥassān and other nomadic Arab tribes dominated the Sanhaja Berber tribes of the western Sahara after the Char Bouba war of the 17th century. As a result, Arabian culture and language came to dominate, and the Berber tribes underwent some Arabization.
Ottoman Turkish era
In the 16th century the northern fringe of the Sahara, such as coastal regencies in present-day Algeria and Tunisia, as well as some parts of present-day Libya, together with the semi-autonomous kingdom of Egypt, were occupied by the Ottoman Empire. From 1517 Egypt was a valued part of the Ottoman Empire, ownership of which provided the Ottomans with control over the Nile Valley, the east Mediterranean and North Africa. The benefit of the Ottoman Empire was the freedom of movement for citizens and goods. Traders exploited the Ottoman land routes to handle the spices, gold and silk from the East, manufactured goods from Europe, and the slave and gold traffic from Africa. Arabic continued as the local language and Islamic culture was much reinforced. The Sahel and southern Sahara regions were home to several independent states or to roaming Tuareg clans.
European colonialism
European colonialism in the Sahara began in the 19th century. France conquered the regency of Algiers from the Ottomans in 1830, and French rule spread south from French Algeria and eastwards from Senegal into the upper Niger to include present-day Algeria, Chad, Mali then French Sudan including Timbuktu (1893), Mauritania, Morocco (1912), Niger, and Tunisia (1881). By the beginning of the 20th century, the trans-Saharan trade had clearly declined because goods were moved through more modern and efficient means, such as airplanes, rather than across the desert.
The French took advantage of long-standing animosity between the Chaamba Arabs and the Tuareg. The newly raised Méhariste camel corps were originally recruited mainly from the Chaamba nomadic tribe. In 1902, the French penetrated the Hoggar mountains and defeated Ahaggar Tuareg in the battle of Tit.
The French Colonial Empire was the dominant presence in the Sahara. It established regular air links from Toulouse (HQ of famed Aéropostale), to Oran and over the Hoggar to Timbuktu and West to Bamako and Dakar, as well as trans-Sahara bus services run by La Compagnie Transsaharienne (est. 1927). A remarkable film shot by famous aviator Captain René Wauthier in 1933 documents the first crossing by a large truck convoy from Algiers to Tchad, across the Sahara.
Egypt, under Muhammad Ali and his successors, conquered Nubia in 1820–22, founded Khartoum in 1823, and conquered Darfur in 1874. Egypt, including Sudan, became a British protectorate in 1882. Egypt and Britain lost control of the Sudan from 1882 to 1898 as a result of the Mahdist War. After its capture by British troops in 1898, the Sudan became an Anglo-Egyptian condominium.
Spain captured present-day Western Sahara after 1874, although Rio del Oro remained largely under Sahrawi influence. In 1912, Italy captured parts of what was to be named Libya from the Ottomans. To promote the Roman Catholic religion in the desert, Pope Pius IX appointed a delegate Apostolic of the Sahara and the Sudan in 1868; later in the 19th century his jurisdiction was reorganized into the Vicariate Apostolic of Sahara.
Egypt became independent of Britain in 1936, although the Anglo-Egyptian treaty of 1936 allowed Britain to keep troops in Egypt and to maintain the British-Egyptian condominium in the Sudan. British military forces were withdrawn in 1954.
Most of the Saharan states achieved independence after World War II: Libya in 1951; Morocco, Sudan, and Tunisia in 1956; Chad, Mali, Mauritania, and Niger in 1960; and Algeria in 1962. Spain withdrew from Western Sahara in 1975, and it was partitioned between Mauritania and Morocco. Mauritania withdrew in 1979; Morocco continues to hold the territory (see Western Sahara conflict).
Tuareg people in Mali rebelled several times during the 20th century before finally forcing the Malian armed forces to withdraw below the line demarcating Azawad from southern Mali during the 2012 rebellion. Islamist rebels in the Sahara calling themselves al-Qaeda in the Islamic Maghreb have stepped up their violence in recent years.
In the post–World War II era, several mines and communities have developed to use the desert's natural resources. These include large deposits of oil and natural gas in Algeria and Libya, and large deposits of phosphates in Morocco and Western Sahara. Libya's Great Man-Made River is the world's largest irrigation project. The project uses a pipeline system that pumps fossil water from the Nubian Sandstone Aquifer System to cities in the populous Libyan northern Mediterranean coast including Tripoli and Benghazi.
A number of Trans-African highways have been proposed across the Sahara, including the Cairo–Dakar Highway along the Atlantic coast, the Trans-Sahara Highway from Algiers on the Mediterranean to Kano in Nigeria, the Tripoli – Cape Town Highway from Tripoli in Libya to N'Djamena in Chad, and the Cairo – Cape Town Highway which follows the Nile. Each of these highways is partially complete, with significant gaps and unpaved sections.
People, culture, and languages
A 19th-century engraving of an Arab slave-trading caravan transporting black African slaves across the Sahara
The people of the Sahara are of various origins. Among them the Amazigh including the Tuareg, various Arabized Amaziɣ groups such as the Hassaniya-speaking Sahrawis, whose populations include the Znaga, a tribe whose name is a remnant of the pre-historic Zenaga language. Other major groups of people include the: Toubou, Nubians, Zaghawa, Kanuri, Hausa, Songhai, Beja, and Fula/Fulani (French: Peul; Fula: Fulɓe). The archaeological evidence from the Holocene period has shown that Nilo-Saharan speaking groups had populated the central and southern Sahara before the influx of Berber and Arabic speakers, around 1500 years ago, who now largely populate the Sahara in the modern era.
Arabic dialects are the most widely spoken languages in the Sahara. Arabic, Berber and its variants now regrouped under the term Amazigh (which includes the Guanche language spoken by the original Berber inhabitants of the Canary Islands) and Beja languages are part of the Afro-Asiatic or Hamito-Semitic family.[citation needed] Unlike neighboring West Africa and the central governments of the states that comprise the Sahara, the French language bears little relevance to inter-personal discourse and commerce within the region, its people retaining staunch ethnic and political affiliations with Tuareg and Berber leaders and culture. The legacy of the French colonial era administration is primarily manifested in the territorial reorganization enacted by the Third and Fourth republics, which engendered artificial political divisions within a hitherto isolated and porous region.[113] Diplomacy with local clients was conducted primarily in Arabic, which was the traditional language of bureaucratic affairs. Mediation of disputes and inter-agency communication was served by interpreters contracted by the French government, who, according to Keenan, "documented a space of intercultural mediation," contributing much to preserving the indigenous cultural identities in the region.
Working The 4Z45 13.50 Daventry Int Rft FL To Mossend Down Yard According To Realtime Trains The Route And Timings Were
Daventry Int Rft Fl 13.50 . 13.39 11E
Daventry South Jn 13.57 . 13.46 3/4 10E
Long Buckby 14.04 . 13.52 11E
Northampton Mill Lane Jn 14.12 1/2 . 13.59 1/4 13E
Northampton North Jn 14.13 1/2 . 14.13 1/2 RT
Northampton 14.14 . 14.14 3/4 RT
Northampton South Jn 14.14 . 14.15 RT
Roade 14.22 . 14.20 3/4 RT
Hanslope Jn 14.26 . 14.23 3/4 2E
Wolverton 14.30 1/2 . 14.27 1/2 2E
Milton Keynes Central 14.33 . 14.29 3/4 3E
Denbigh Hall North Jn 14.34 . 14.30 1/4 3E
Denbigh Hall South Jn 14.35 . 14.31 1/4 3E
Bletchley 14.36 . 14.32 1/2 3E
Bletchley South Jn 14.36 No Report
Bletchley Water Eaton Rd 14.36 1/2 No Report
Bletchley Drayton Road Jn 14.37 . 14.32 3/4 4E
Leighton Buzzard 14.41 1/2 . 14.37 1/4 4E
Ledburn Jn 14.44 . 14.39 1/2 4E
Cheddington 14.45 1/2 . 14.40 3/4 4E
Tring North Jn 14.49 1/2 . 14.46 3E
Tring 14.50 . 14.46 1/2 3E
Berkhamsted 14.53 . 14.51 3/4 1E
Bourne End Jn (Herts) 14.55 . 14.55 RT
Hemel Hempstead 14.56 1/2 . 14.56 3/4 RT
Apsley 14.59 . 14.58 1/2 RT
Kings Langley 15.02 . 15.00 3/4 1E
Watford North Jn 15.06 1/2 . 15.04 1/4 2E
Watford Junction 15.07 1/2 . 15.05 2E
Watford South Jcn 15.08 . 15.05 1/2 2E
Bushey 15.09 1/2 . 15.06 1/2 3E
Harrow & Wealdstone 15.16 1/2 . 15.11 3/4 4E
North Wembley Jn 15.24 . 15.13 1/2 10E
Wembley Central 15.27 . 15.14 1/2 12E
Willesden Sudbury Jn 15.28 1/2 . 15.15 13E
Willesden North Junction 15.31 . 15.16 1/2 14E
Willesden West Londn Jn 15.32 . 15.17 14E
Queens Park (London) 15.34 . 15.19 1/2 14E
Camden Jn 15.37 . 15.22 1/4 14E
Primrose Hill 15.38 1/2 No Report
Camden Road Jn Signal 1202 15.38 1/2 No Report
Camden Road Jn 15.41 To 15.44 15.38 . 15.37 3/4 6E
Camden Road 15.45 . 15.38 6E
Camden Road Central Jn 15.45 1/2 No Report
Camden Road Incline Jn 15.46 No Report
York Way North Jn 15.47 1/2 No Report
Copenhagen Junction 15.48 1/2 . 15.44 1/2 3E
Holloway Sth. Jn 15.51 1/2 . 15.47 4E
Finsbury Park 15.54 1/2 . 15.50 1/2 3E
Harringay 15.56 1/2 . 15.53 3/4 2E
Hornsey 15.58 . 15.54 3/4 3E
Alexandra Palace 16.00 . 15.56 1/2 3E
Bowes Park 16.01 . 15.59 1E
Palmers Green 16.02 1/2 . 16.00 3/4 1E
Winchmore Hill 16.04 1/2 . 16.02 2E
Grange Park 16.05 1/2 . 16.03 2E
Enfield Chase 16.06 1/2 . 16.04 2E
Gordon Hill 16.07 1/2 . 16.05 2E
Crews Hill 16.09 1/2 . 16.06 1/2 2E
Cuffley 16.11 1/2 . 16.08 1/2 2E
Bayford 16.15 1/2 . 16.11 3/4 3E
Hertford North 16.19 . 16.14 3/4 4E
Molewood Junction 16.24 1/2 . 16.16 1/4 8E
Watton-at-Stone 16.27 1/2 . 16.19 8E
Bragbury Junction 16.30 . 16.21 1/2 8E
Langley Sth Jn 16.33 1/2 . 16.33 RT
Langley Jn 16.34 . 16.36 2L
Stevenage 16.35 1/2 . 16.37 1/4 1L
Hitchin 16.39 1/2 . 16.41 1/4 1L
Arlesey 16.43 1/2 . 16.45 1/2 1L
Biggleswade 16.47 . 16.49 2L
Sandy 16.49 1/2 . 16.51 1/4 1L
St Neots 16.56 . 16.57 1/4 1L
Huntingdon 17.02 1/2 . 17.03 1/4 RT
Connington South Jn 17.11 . 17.09 3/4 1E
Holme Jn 17.13 . 17.11 3/4 1E
Fletton Jn 17.19 . 17.17 1E
Peterborough [PBO] 17.21 To 17.23 17.19 3/4 . 17.24 1/4 1L
New England Nth Jn 17.25 . 17.27 1/2 2L
Werrington Jn 17.26 1/2 . 17.29 1/2 2L
Helpston Jn 17.29 . 17.31 1/4 2L
Tallington Jn 17.32 . 17.33 1/2 1L
Stoke Jn 17.44 . 17.45 1/2 1L
Highdyke Jn 17.45 1/2 . 17.47 1L
Grantham 17.48 1/2 . 17.50 1/2 2L
Nottingham Branch Jn 17.49 . 17.50 3/4 1L
Barkston South Jn 17.52 . 17.53 1L
Claypole Loop 17.57 . 17.58 1/4 1L
Newark North Gate 18.00 1/2 . 18.02 1/4 1L
Newark F.C. 18.01 1/2 . 18.02 1/2 1L
Carlton On Trent Loop 18.08 1/2 . 18.06 3/4 1E
Retford 18.20 1/2 . 18.16 3/4 3E
Babworth Loop 18.21 1/2 No Report
Retford Crossover 18.22 . 18.17 1/2 4E
Ranskill Loop 18.26 To 19.02 18.22 3/4 . 18.58 1/2 3E
Loversall Carr Jn 19.11 . 19.07 3E
Black Carr Jn (Doncaster) 19.12 . 19.08 1/4 3E
Potteric Carr Jn 19.12 1/2 . 19.08 3/4 3E
Decoy Nth Jn 19.13 . 19.08 3/4 3E
Bridge Jn 19.14 . 19.10 3/4 3E
Doncaster 19.14 1/2 . 19.13 1E
Donc. Marshgate Jn 19.15 . 19.13 1/2 1E
Arksey Loop 19.16 . 19.14 1/2 1E
Shaftholme Jn 19.18 . 19.16 1/2 1E
Joan Croft Jn 19.18 1/2 . 19.17 1E
Temple Hirst Jn 19.25 . 19.24 1E
Hambleton South Jn 19.29 No Report
Hambleton North Jn 19.29 1/2 . 19.28 1E
Colton Jn 19.37 . 19.35 2E
Colton North Jn 19.38 No Report
York Holgate Jcn 19.42 No Report
York [YRK] 19.43 To 19.50 19.42 . 19.50 RT
Skelton Jn (York) 19.54 . 19.53 1E
Skelton Bridge Jn 19.56 No Report
Tollerton Jn 20.04 . 20.03 1E
Pilmoor Apco 20.09 No Report
Thirsk 20.15 . 20.17 2L
Longlands Jn 20.20 1/2 . 20.23 2L
Northallerton 20.21 1/2 . 20.24 2L
East Cowton Xovers 20.28 No Report
Darlington South Jn 20.33 1/2 . 20.36 3/4 3L
Darlington 20.34 . 20.37 3L
Darlington North Jn 20.34 1/2 . 20.37 2L
Aycliffe 20.38 1/2 No Report
Bradbury Apco 20.41 1/2 No Report
Ferryhill Sth. Jn 20.44 . 20.46 3/4 2L
Tursdale Jn 20.46 . 20.48 3/4 2L
Durham 20.52 . 20.55 3L
Chester-le-Street 20.57 1/2 . 20.59 3/4 2L
Birtley Jn 21.00 1/2 . 21.02 1L
Low Fell Jn 21.02 1/2 . 21.03 3/4 1L
King Edward Bridge S. Jn 21.04 . 21.06 3/4 2L
King Edward Bridge N. Jn 21.04 1/2 . 21.07 1/2 2L
Newcastle [NCL] 21.07 To 21.09 21.09 1/2 . 21.12 1/2 3L
Manors 21.11 . 21.15 1/4 4L
Heaton Sth. Jn 21.15 . 21.18 1/4 3L
Heaton North Jn 21.16 . 21.19 3L
Benton Nth Jn 21.17 1/2 No Report
Cramlington 21.22 1/2 . 21.25 2L
Morpeth 21.28 1/2 . 21.31 1/4 2L
Morpeth North Jn 21.29 . 21.32 1/4 3L
Pegswood 21.30 . 21.33 1/4 3L
Butterwell Jn 21.32 . 21.34 1/2 2L
Widdrington 21.34 . 21.37 1/2 3L
Chevington Loop 21.36 . 21.39 3/4 3L
Acklington 21.38 1/2 . 21.41 2L
Wooden Gate Jn 21.42 1/2 . 21.45 1/4 2L
Alnmouth 21.43 1/2 . 21.46 1/2 3L
Little Mill Lc 21.47 . 21.49 1/4 2L
Chathill Apco 21.52 1/2 No Report
Chathill 21.52 1/2 . 21.55 3/4 3L
Belford L.C. 21.57 . 21.59 2L
Crag Mill Loop 21.57 1/2 No Report
Beal L.C. 22.04 No Report
Tweedmouth S.B. 22.09 1/2 . 22.11 1L
Berwick-upon-Tweed 22.10 1/2 . 22.12 1L
Reston Signal Eg403 22.13 1/2 . 22.15 1L
Burnmouth 22.15 1/2 . 22.17 1/4 2L
Reston 22.19 1/2 . 22.20 1/2 1L
Grantshouse 22.24 1/2 . 22.25 1/4 RT
Cockburnpath 22.28 . 22.29 RT
Innerwick G.S.P. 22.29 1/2 . 22.31 1L
Oxwellmains Crossover 22.32 1/2 . 22.33 1/2 1L
Dunbar 22.34 1/2 . 22.35 1/4 RT
Stenton G.S.P. 22.38 1/2 . 22.39 RT
Drem 22.44 1/2 . 22.44 1/4 RT
Longniddry Apco 22.48 No Report
Longniddry 22.48 1/2 . 22.47 3/4 RT
Blindwells Opencast 22.51 . 22.50 RT
Prestonpans 22.51 1/2 . 22.50 3/4 RT
Wallyford 22.53 1/2 . 22.52 1/4 RT
Monktonhall Jn 22.55 . 22.53 1E
Musselburgh 22.55 1/2 . 22.54 1E
Portobello Jn (Lothian) 22.57 . 22.55 1/4 1E
Craigentinny Jn 22.58 1/2 . 22.57 1/2 RT
Abbeyhill Jn 22.59 1/2 . 22.59 1/2 RT
Edinburgh [EDB] 23.01 To 23.03 Pass 23.02 1/2 RT
Princes St Gardens 23.05 . 23.03 1/4 1E
Haymarket 23.06 . 23.05 1/2 RT
Slateford 23.07 . 23.08 1/4 1L
Kingsknowe 23.08 . 23.08 1/4 RT
Wester Hailes 23.09 . 23.11 1/4 2L
Curriehill 23.11 1/2 . 23.09 3/4 1E
Kirknewton 23.17 1/2 . 23.15 1/2 1E
Midcalder Jn 23.18 1/2 . 23.16 1/4 2E
Livingston South 23.21 . 23.17 3/4 3E
West Calder 23.25 . 23.20 3/4 4E
Addiewell 23.27 1/2 . 23.22 5E
Breich 23.31 . 23.24 1/2 6E
Fauldhouse 23.34 . 23.26 1/4 7E
Benhar Jn 23.35 . 23.27 1/4 7E
Shotts 23.38 1/2 . 23.30 1/2 7E
Hartwood 23.40 . 23.31 3/4 8E
Cleland 23.43 1/2 . 23.35 1/4 8E
Carfin 23.45 1/2 . 23.37 1/2 7E
Holytown Jn 23.46 . 23.37 3/4 8E
Holytown 23.47 . 23.38 3/4 7E
Mossend East Jn 23.49 . 23.44 5E
Mossend North Jn 23.51 . 23.47 3E
Mossend Down Yard 23.53 . 23.48 5E
SN/NC: Washingtonia Robusta, Arecaceae Family
Washingtonia robusta (Mexican fan palm or Mexican washingtonia) is a palm tree native to western Sonora, and Baja California Sur in northwestern Mexico. It is reportedly naturalized in Spain, the Canary Islands, Réunion, Hawaii, Florida and California. Washingtonia robusta grows to 25 m (82 ft) tall, rarely up to 30 m (98 ft). The leaves have a petiole up to 1 m (3.3 ft) long, and a palmate fan of leaflets up to 1 m long. The inflorescence is up to 3 m (9.8 ft) long, with numerous small pale orange-pink flowers. The fruit is a spherical, blue-black drupe, 6–8 mm (0.24–0.31 in) diameter; it is edible, though thin-fleshed.
Like the closely related Washingtonia filifera (California Fan Palm), it is grown as an ornamental tree. Although very similar, the Mexican Washingtonia has a narrower trunk (which is typically somewhat wider at the base), and grows slightly faster and taller; it is also somewhat less cold hardy than the California Washingtonia, hardy to about −8 °C (18 °F). The Palm was originally introduced to Los Angeles to beautify the town for the 1932 Summer Olympics. Many Palms planted then in Los Angeles are near the end of their natural lives and are fully mature. Most of these trees are not being replaced with other Mexican Washingtonia Palms but with other full-spread trees like oak trees and sycamores which trap more air pollution and provide more shade. From Los Angeles the Palms began to spread to other areas in the United States. Unlike Washingtonia filifera, which has been cultivated as far north as Oklahoma and Southwestern Utah, the Mexican fan palm can be grown mainly around areas of the southwestern United States, such as California and the coast of Oregon, Arizona, Southern Nevada, and New Mexico. It may also be seen along the Gulf Coast from Texas to Florida and may also be found in coastal Georgia and South Carolina.
Washingtonia × filibusta is a hybrid of W. robusta and W. filifera and has intermediate characteristics of the two parents, especially greater tolerance of wet cold. (Wikipedia).
Nombres comunes: Washingtonia, Wachintona, Palma mexicana, Pritchardia, Pichardia, Palmera de abanico mejicana, Palmera mexicana y Washingtonia robusta.
Arecaceae (antes Palmaceae).
Originaria del Noroeste de México y California.
Género dedicado a George Washington (1732-1799), primer presidente de Estados Unidos.
Por su parte, el nombre científico de robusta, lo toma por tener el mayor porte dentro de las Pitchardias.
Es la palmera de crecimiento más veloz, más rústica y más económica.
Se diferencia de la otra Washingtonia (W. filifera) por tener el tronco mas fino y es más alta. Por tanto, Washingtonia robusta, tronco delgado (lo contrario a lo que su nombre haría creer).
Cuando son jóvenes, no es fácil distinguirlas, la diferencia se va evidenciando a medida que van madurando.
Supera los 30 m de altura.
La corteza es de color pardo grisáceo.
Hojas muy grandes y de hasta dos metros de diámetro de color verde brillante, las hojas viejas no poseen hilos o filamentos o tienen muy pocos.
Las hojas secas se mantienen en la palmera caídas hacia al tronco.
Pequeñas flores hermafroditas de color blanco y pequeños frutos de menos de un centímetro y de color pardo.
Se utiliza en grupos y en alineaciones.
Apta para macetones grandes.
A palmeira-de-saia ou palmeira-da-california é nativa dos oásis nos desertos da Califórnia, Arizona e noroeste do México. De estipe único e cinzento, ela pode alcançar 20 metros de altura e 60 a 80 centímetros de diâmetro. Suas folhas são grandes, em forma de leque e formam uma copa aberta. As folhas mortas persistem, ao invés de cair como em outras palmeiras, criando uma saia volumosa, pardo-amarronzada, característica da espécie.
Esta saia no entanto pode abrigar pragas, roedores e pombos e é muito inflamável, de forma que a remoção destas folhas pode ser indicada em alguns casos. As inflorescências contêm numerosas flores branco-amareladas que dão origem a pequenos frutos, do tipo drupa, de coloração vermelho-escura.
A palmeira-de-saia é indicada para plantio em majestosos grupos alinhados, ao longo de avenidas e ruas. Encaixa-se perfeitamente em jardins tropicais e mediterrâneos, principalmente no litoral. No entanto, devemos evitar o plantio da palmeira muito jovem (com estipe muito pequeno) ao longo de caminhos e calçadas, pois os espinhos dos pecíolos podem machucar os pedestres. Quando jovem, pode ser plantada em vasos na decoração de interiores, mas requer bastante luminosidade.
St Hilary's Chapel (also St Hilary's Church) is a former church in Denbigh, Denbighshire, north Wales, of which only the tower remains. The town's garrison church, it lay to the north Denbigh Castle. It dates to c. 1290, when the borough town was built by Henry de Lacy, Earl of Lincoln; the earliest mention of it is in 1334. In the 1530s the antiquary John Leland described it as a "goodlye and large chappelle in the old towne... whither most of the new towne do yett cumme". On 28 September 1645, during the English Civil War, a service at the church was attended by Charles I, the Archbishop of York, Lord Keeper Williams and numerous other important officials.
The limestone rubble church with red and brown and green sandstone dressings was abandoned in 1874 when a church was erected at St Mary's Church, Lenten Pool. In 1923 the church was largely demolished, leaving just the tower of roughly 14 metres (46 ft). The tower became a Grade I listed building on 24 October 1950.[
Denbigh is a market town and a community in Denbighshire, Wales. Formerly the county town of the historic county of Denbighshire until 1888, Denbigh's Welsh name (Dinbych) translates to "Little Fortress"; a reference to its historic castle. Denbigh lies near the Clwydian Hills.
Denbigh Castle, together with its town walls, was built in 1282 (742 years ago) by order of King Edward I. The Burgess Gate, whose twin towers adorn the symbol on Denbigh's civic seal, was once the main entrance into the town. The first borough charter was granted to Denbigh in 1290, when the town was still contained within the old town walls. It was the centre of the Marcher Lordship of Denbigh. The town was involved in the revolt of Madog ap Llywelyn in 1294–1295; the castle was captured in the autumn and, on 11 November 1294, a relieving force was defeated by the Welsh rebels. The town was recaptured by Edward I in December. Denbigh was also burnt in 1400 during the revolt of Owain Glyndŵr.
During the Wars of the Roses (1455–1487), the town was largely destroyed, subsequently moving from the hilltop to the area of the present town market.
Leicester's Church is an unfinished church. In 1579, Robert Dudley, 1st Earl of Leicester, who was also Baron of Denbigh, planned for there to be a cathedral. His intention was to move the status of city from neighbouring St Asaph. The project ran out of money and, when Robert Dudley died, it was left as ruins; it is now in the care of Cadw.
In 1643, during the English Civil War, Denbigh became a refuge for a Royalist garrison. Surrendering in 1646, the castle and town walls eventually fell into ruin.
The town grew around the textile industry in the 1600s, hosting specialist glovers, weavers, smiths, shoemakers, saddlers, furriers and tanners. Denbigh has been an important location for the agricultural industry throughout its history.
Denbigh railway station once served the town on the former London and North Western Railway, later part of the London, Midland and Scottish Railway.
It was a junction for the Vale of Clwyd Railway line, which lead north to St Asaph and Rhyl, and the Mold and Denbigh Junction Railway. The former was closed in 1955, leaving Denbigh on a lengthy branch running from Chester to Ruthin, via Mold, which subsequently closed in 1962. A southern continuation beyond Ruthin, linking up with the Great Western Railway at Corwen, had closed in 1952.
The station site has been redeveloped since into a small retail park; however, remains of a platform can still be seen beside the road leading to the Home Bargains store, Aldi Supermarket and two charity shops.
At one time, the majority of the population sought employment at the North Wales Hospital, which, dating back to the 1840s, cared for people with psychiatric illnesses. The hospital closed in 1995 and has since fallen into disrepair. In October 2008, a special series of episodes of Most Haunted, titled Village of the Damned, was broadcast from the North Wales Hospital over 7 days. As of October 2018, the derelict building has passed into the ownership of Denbighshire County Council.
Denbigh had a town cinema on Love Lane. It opened as the Scala in 1928, before being re-branded as the Wedgwood Cinema in the late 1970s. It closed in October 1980, then reopened by Lewis Colwell in 1982 and renamed the Futura Cinema. The cinema closed again in the 1990s, but the building remained open as a video rental store. In 1995, Peter Moore reopened the cinema for a short period before being arrested and convicted of the murder of four men. The video rental store closed and the building is now in ruin awaiting redevelopment. Denbigh has no permanent cinema, though Denbigh Film Club regularly operates in Theatr Twm o'r Nant.
The population at the 2001 Census was 8,783,[10] increasing to 8,986 in the 2011 census., reducing in the 2021 census to 8,669.
Attractions in the town include Denbigh Library, Denbigh Castle and the castle walls, Cae Dai 1950s museum, Theatr Twm o'r Nant, medieval parish church St Marcella's, and a small shopping complex. Denbigh Boxing Club is located on Middle Lane. Denbigh Community Hospital was established in 1807. Denbigh Town Hall is a Grade II* listed building.
Denbigh Cricket Club is one of the oldest cricket clubs in Wales having been established in 1844. The club plays at the Ystrad Road ground and plays in the North Wales Cricket League. The 1st XI play in the Premier Division having won the Division 1 championship in 2010 with the 2nd XI in Division 3.
For over 50 years, a barrel rolling competition has been held on Boxing Day in the town square.
There are a number of places to stay in Denbigh, including Tyn Yr Eithin, a caravan, camping, and glamping site based on the edge of the town which has been hosting tourists since 1986.
There are three secondary schools located in Denbigh. Denbigh High School is the larger of the two, consisting of nearly 600 pupils and approximately 60 staff. The current headmaster is Glen Williams.
St Brigid's is a Catholic voluntary aided school on Mold Road on the outskirts of the town which caters for pupils between the ages of 3 – 19. There is a strict admissions policy and until 2009 the school only accepted girls. The schools current headteacher is Leah Crimes.
Myddleton College is the former Howell's Preparatory School and is an independent co-educational day and boarding school.
All 3 of these High Schools in Denbigh, along with Ysgol Brynhyfryd (Ruthin), Ysgol Glan Clwyd (St Asaph), Denbigh College, and Llysfasi College (Deeside) have joined to offer a combined 6th form under the title 'The Dyffryn Clwyd Consortium'.
Crest Mawr Wood (alt. - Crêst) is a Site of Special Scientific Interest to the north west, adjoining Denbigh Golf Club and the Tarmac Quarry, an historic and ancient deciduous woodland. This woodland is endangered due to environmental pressure and competing land use in the area.
Denbigh hosted the National Eisteddfod of Wales in 1882, 1939, 2001 and 2013.
Notable people
Rhoda Broughton (1840–1920), novelist
Elizabeth Casson (1881–1954) doctor and occupational therapy pioneer.
Shefali Chowdhury (born 1988), actor, notably in the Harry Potter films
CDawgVA (born 1996), YouTuber and podcaster, presenter of Trash Taste
Robert Dudley, 1st Earl of Leicester (1532–1588), also known as Baron of Denbigh
Thomas Gee (1815–1898), a Welsh Nonconformist preacher, journalist and publisher.
David Griffith (1800–1894), known as "Clwydfardd" a Welsh poet and Archdruid of the National Eisteddfod of Wales.
Dr Samuel Johnson (1709–1784), visited friends and relation in Denbigh many times and has an urn memorial in his honour in the woods nearby.
Professor Edward Taylor Jones FRSE (1872–1961), physicist
Eirian Llwyd (1951–2014), printmaker and wife of former Plaid Cymru leader Ieuan Wyn Jones
Humphrey Llwyd (1527–1568), a Welsh cartographer, author, antiquary and MP.
Sir Hugh Myddleton (1560–1631), royal jeweller, goldsmith and entrepreneur.
Thomas Myddelton (1550–1631) a Welsh merchant, Lord Mayor of London & MP
Twm o'r Nant (1739–1810), playwright, real name Thomas Edwards
Beatrix Potter (1866–1943), spent summers with her aunt and uncle at Gwaenynog Hall between 1895 and 1913 and used their large garden as inspiration for The Tale of Peter Rabbit
Susan Reynolds (1929–2021) a medieval historian
Kate Roberts (1891–1985), Welsh language writer.
Several members of the Salusbury Family, who represented Denbigh over the years.
Sir Henry Morton Stanley (1841–1904), a journalist and explorer
Mark Webster (born 1983) Welsh darts international, winner of the BDO World Darts Championship 2008
Bryn Williams (born 1977), TV chef who won the Great British Menu BBC TV programme.
Denbighshire is a county in the north-east of Wales. It borders the Irish Sea to the north, Flintshire to the east, Wrexham to the southeast, Powys to the south, and Gwynedd and Conwy to the west. Rhyl is the largest town, and Ruthin is the administrative centre. Its borders differ from the historic county of the same name.
Denbighshire has an area of 326 square miles (840 km2) and a population of 95,800, making it sparsely populated. The most populous area is the coast, where Rhyl (25,149) and Prestatyn (19,085) form a single built-up area with a population of 46,267. The next-largest towns are Denbigh (8,986), Ruthin (5,461), and Rhuddlan (3,709). St Asaph (3,355) is a city. All of these settlements are in the northern half of the county; the south is even less densely populated, and the only towns are Corwen (2,325) and Llangollen (3,658).
The geography of Denbighshire is defined by the broad valley of the River Clwyd, which is surrounded by rolling hills on all sides except the north, where it reaches the coast. The Vale of Clwyd, the lower valley, is given over to crops, while cattle and sheep graze the uplands. The Clwydian Range in the east is part of the Clwydian Range and Dee Valley Area of Outstanding Natural Beauty.
This part of Wales contains the country's oldest known evidence of habitation – Pontnewydd (Bontnewydd-Llanelwy) Palaeolithic site has Neanderthal remains of some 225,000 years ago. The county is also home to several medieval castles, including Castell Dinas Brân, Denbigh, and Rhuddlan, as well as St Asaph Cathedral. Llangollen International Musical Eisteddfod takes place in the town each July.
The main area was formed on 1 April 1996 under the Local Government (Wales) Act 1994, from various parts of the county of Clwyd. It includes the district of Rhuddlan (formed in 1974 entirely from Flintshire), the communities of Trefnant and Cefn Meiriadog from the district of Colwyn (entirely Denbighshire) and most of the Glyndŵr district. The last includes the former Edeyrnion Rural District, part of the administrative county of Merionethshire before 1974, covering the parishes of Betws Gwerfil Goch, Corwen, Gwyddelwern, Llangar, Llandrillo yn Edeirnion and Llansanffraid.
Other principal areas including part of historical Denbighshire are Conwy, which picked up the remainder of 1974–1996 Colwyn, the Denbighshire parts of 1974–1996 Aberconwy, and Wrexham, which corresponds to the pre-1974 borough of Wrexham along with most of Wrexham Rural District and several parishes of Glyndŵr. Post-1996 Powys includes the historically Denbighshire parishes of Llanrhaeadr-ym-Mochnant, Llansilin and Llangedwyn, which formed part of Glyndŵr district.
Researchers have found signs that Denbighshire was inhabited at least 225,000 years ago. Bontnewydd Palaeolithic site is one of the most significant in Britain. Hominid remains of probable Neanderthals have been found, along with stone tools from the later Middle Pleistocene.
In 2021 February, archaeologists from Aeon Archaeology announced a discovery of over 300 Stone Age tools and artifacts in Rhuddlan. They revealed scrapers, microliths, flakes of chert (a hard, fine-grained, sedimentary rock composed of microcrystalline or cryptocrystalline quartz), flints and other rudimentary tools. An expert, Richard Cooke, believes the lithic remains belonged to ancient peoples, who while passing through the area, made camp by the river more than 9,000 years ago.
The eastern edge of Denbighshire follows the ridge of the Clwydian Range, with a steep escarpment to the west and a high point at Moel Famau (1,820 ft (555 m)), which with the upper Dee Valley forms an Area of Outstanding Natural Beauty, the Clwydian Range and Dee Valley – one of just five in the Wales. The Denbigh Moors (Mynydd Hiraethog) are in the west of the county and the Berwyn Range adjacent to the southern edge. The River Clwyd has a broad fertile Vale running from south–north in the centre of the county. There is a narrow coastal plain in the north which much residential and holiday-trade development. The highest point in the historic county was Cadair Berwyn at 832 m or 2,730 ft), but the boundary changes since 1974 make Cadair Berwyn North Top the highest point. Denbighshire borders the present-day principal areas of Gwynedd, Conwy County Borough, Flintshire, Wrexham County Borough, and Powys.
Rhyl and Prestatyn form a single built-up area in the north of the county, with a population of 46,267. They are immediately adjacent to the Kinmel Bay and Abergele built-up area in neighbouring Conwy, and at the eastern end of series of coastal resorts which that also includes Colwyn Bay and Llandudno further west.
According to the 2021 United Kingdom census, Denbighshire's population was approximately 95,800. According to previous censuses, the population of Denbighshire was 93,734 in 2011 and 93,065 in 2001. The largest towns on the coast are Rhyl (2001 population c. 25,000) and Prestatyn (2001 population c. 18,000). According to the 2011 Census returns, 24.6 per cent stated they could speak Welsh.
Since the 20th-century demise of the coal and steel industries in the Wrexham area, there is no heavy industry in the county. Although most towns have small industrial parks or estates for light industry, the economy is based on agriculture and tourism. Much of the working population is employed in the service sector. The uplands support sheep and beef cattle rearing, while in the Vale of Clwyd dairy farming and wheat and barley crops predominate. Many towns have livestock markets and farming supports farm machinery merchants, vets, feed merchants, contractors and other ancillaries. With their incomes on the decline, farmers have found opportunities in tourism, rural crafts, specialist food shops, farmers' markets and value-added food products.
The upland areas with their sheep farms and small, stone-walled fields are attractive to visitors. Redundant farm buildings are often converted into self-catering accommodation, while many farmhouses supply bed and breakfast. The travel trade began with the arrival of the coast railway in the mid-19th century, opening up the area to Merseyside. This led to a boom in seaside guest houses. More recently, caravan sites and holiday villages have thrived and ownership of holiday homes increased. Initiatives to boost the economy of North Wales continue, including redevelopment of the Rhyl seafront and funfair.
The North Wales Coast Line running from Crewe to Holyhead is served by Transport for Wales and Avanti West Coast services. Trains leaving Crewe to pass through Chester, cross the River Dee into Wales, and continue through Flint, Shotton, Holywell Junction (closed in 1966), Prestatyn, Rhyl, and stations to Bangor and Holyhead, which has a ferry service to Ireland.
There are no motorways in Denbighshire. The A55 dual carriageway runs from Chester through St Asaph to the North Wales coast at Abergele, then parallel to the railway through Conwy and Bangor to Holyhead. The A548 run from Chester to Abergele through Deeside and along the coast, before leaving the coast and terminating at Llanrwst. The main road from London, the A5, passes north-westwards through Llangollen, Corwen and Betws-y-Coed to join the A55 and terminate at Bangor. The A543 crosses the Denbigh Moors from south-east to north-west, and the A525 links Ruthin with St Asaph.
There are local bus services between the main towns. Several services by Arriva Buses Wales run along the main coast road between Chester and Holyhead, linking the coastal resorts. Another route links Rhyl to Denbigh.
Denbighshire is represented in the House of Commons by three MPs. The Welsh Labour Party lost to the Welsh Conservatives in the 2019 general election for the first time.
The following MPs were elected from Denbighshire in 2019:
Simon Baynes (Welsh Conservatives) in Clwyd South, first elected in 2019.
David Jones (Welsh Conservatives) in Clwyd West, first elected in 2005.
James Davies (Welsh Conservatives) in Vale of Clwyd, first elected in 2019.
Denbighshire is also represented in the Senedd by three members elected in 2021:
Ken Skates (Welsh Labour) in Clwyd South, first elected in 2011
Darren Millar (Welsh Conservatives) in Clwyd West, first elected in 2007
Gareth Davies (Welsh Conservatives) in Vale of Clwyd, first elected in 2021.
In 2019, research by UnHerd in association with the pollster FocalData showed that most people across the county support the British monarchy.
Denver & Rio Grande Western C-18 #315 starts her climb up the 2.5% grade just north of the US 550 crossing in Hermosa, CO (MP 462.8), hauling a short photo freight bound for Silverton, during the Durango & Silverton Narrow Gauge Railroad's 2010 "Railfest" event. While most photographers seem to prefer to shoot the grade crossing a hundred yards or so to my left, I much prefer various angles on this hill, because it's the beginning of a tough, steady grade and you'll almost always get a great smoke plume from the locomotive here. In the years since the railroad converted all of their own steam locomotives to oil firing, this has become a favorite spot for the engine crews to sand the flues, producing some very impressive black clouds.
Just west of Toltec Creek, near Milepost 313.7, Denver & Rio Grande C-18 Consolidation #315 charges upgrade past one of the most unique rock formations on the San Juan Extension. Carved by mother nature, not by the railroad, this rock looks for the world (to me, at least) like the head of a horse, overlooking the track. The area just beyond the train is the historic site of the Toltec Section House and water tower and historic photos of this area from this vantage point depict this rock very prominently, albeit with almost no tree cover at all. As can be seen here, the area is now heavily lined with groves of aspen trees, which turn a beautiful golden color in the fall.
This image was captured during a September 2013 photo shoot on the Cumbres & Toltec Scenic Railroad, which featured Denver & Rio Grande Western C-18 Consolidation #315, as well as Denver & Rio Grande Western K-27 Mikado #463. The latter engine is actually on the train depicted here as a mid-train helper.
The Sahara (/səˈhɑːrə/, /səˈhærə/) is a desert spanning across North Africa. With an area of 9,200,000 square kilometres (3,600,000 sq mi), it is the largest hot desert in the world and the third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic.
The name "Sahara" is derived from Arabic: صَحَارَى, romanized: ṣaḥārā /sˤaħaːraː/, a broken plural form of ṣaḥrā' (صَحْرَاء /sˤaħraːʔ/), meaning "desert".
The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and the Sudan.
It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.
For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 20,000-year cycle caused by the precession of Earth's axis (about 26,000 years) as it rotates around the Sun, which changes the location of the North African monsoon.
Geography
The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers 9 million square kilometres (3,500,000 sq mi), amounting to 31% of Africa. If all areas with a mean annual precipitation of less than 250 mm (9.8 in) were included, the Sahara would be 11 million square kilometres (4,200,000 sq mi). It is one of three distinct physiographic provinces of the African massive physiographic division. Sahara is so large and bright that, in theory, it could be detected from other stars as a surface feature of Earth, with near-current technology.
The Sahara is mainly rocky hamada (stone plateaus); ergs (sand seas – large areas covered with sand dunes) form only a minor part, but many of the sand dunes are over 180 metres (590 ft) high. Wind or rare rainfall shape the desert features: sand dunes, dune fields, sand seas, stone plateaus, gravel plains (reg), dry valleys (wadi), dry lakes (oued), and salt flats (shatt or chott). Unusual landforms include the Richat Structure in Mauritania.
Several deeply dissected mountains, many volcanic, rise from the desert, including the Aïr Mountains, Ahaggar Mountains, Saharan Atlas, Tibesti Mountains, Adrar des Iforas, and the Red Sea Hills. The highest peak in the Sahara is Emi Koussi, a shield volcano in the Tibesti range of northern Chad.
The central Sahara is hyperarid, with sparse vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub, with trees and taller shrubs in wadis, where moisture collects. In the central, hyperarid region, there are many subdivisions of the great desert: Tanezrouft, the Ténéré, the Libyan Desert, the Eastern Desert, the Nubian Desert and others. These extremely arid areas often receive no rain for years.
To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb, the Sahara borders the Mediterranean forest, woodland, and scrub eco-regions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White and geographer Robert Capot-Rey, the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto, a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The northern limit also corresponds to the 100 mm (3.9 in) isohyet of annual precipitation.
To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Important cities located in the Sahara include Nouakchott, the capital of Mauritania; Tamanrasset, Ouargla, Béchar, Hassi Messaoud, Ghardaïa, and El Oued in Algeria; Timbuktu in Mali; Agadez in Niger; Ghat in Libya; and Faya-Largeau in Chad.
Climate
The Sahara is the world's largest hot desert. It is located in the horse latitudes under the subtropical ridge, a significant belt of semi-permanent subtropical warm-core high pressure where the air from the upper troposphere usually descends, warming and drying the lower troposphere and preventing cloud formation.
The permanent absence of clouds allows unhindered light and thermal radiation. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal chance of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The subtropical ridge is the predominant factor that explains the hot desert climate (Köppen climate classification BWh) of this vast region. The descending airflow is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert: this is the sunniest, driest and the most nearly "rainless" place on the planet, rivaling the Atacama Desert, lying in Chile and Peru.
The rainfall inhibition and the dissipation of cloud cover are most accentuated over the eastern section of the Sahara rather than the western. The prevailing air mass lying above the Sahara is the continental tropical (cT) air mass, which is hot and dry. Hot, dry air masses primarily form over the North-African desert from the heating of the vast continental land area, and it affects the whole desert during most of the year. Because of this extreme heating process, a thermal low is usually noticed near the surface, and is the strongest and the most developed during the summertime. The Sahara High represents the eastern continental extension of the Azores High, centered over the North Atlantic Ocean. The subsidence of the Sahara High nearly reaches the ground during the coolest part of the year, while it is confined to the upper troposphere during the hottest periods.
The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by its geographical configuration and location. Indeed, the extreme aridity of the Sahara is not only explained by the subtropical high pressure: the Atlas Mountains of Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier, causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates.
The primary source of rain in the Sahara is the Intertropical Convergence Zone, a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and southern Sahara. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by: extremely low, unreliable, highly erratic rainfall; extremely high sunshine duration values; high temperatures year-round; negligible rates of relative humidity; a significant diurnal temperature variation; and extremely high levels of potential evaporation which are the highest recorded worldwide.
Temperature
The sky is usually clear above the desert, and the sunshine duration is extremely high everywhere in the Sahara. Most of the desert has more than 3,600 hours of bright sunshine per year (over 82% of daylight hours), and a wide area in the eastern part has over 4,000 hours of bright sunshine per year (over 91% of daylight hours). The highest values are very close to the theoretical maximum value. A value of 4300 hours (98%) of the time would be[clarification needed] recorded in Upper Egypt (Aswan, Luxor) and in the Nubian Desert (Wadi Halfa). The annual average direct solar irradiation is around 2,800 kWh/(m2 year) in the Great Desert. The Sahara has a huge potential for solar energy production.
The high position of the Sun, the extremely low relative humidity, and the lack of vegetation and rainfall make the Great Desert the hottest large region in the world, and the hottest place on Earth during summer in some spots. The average high temperature exceeds 38 to 40 °C (100.4 to 104.0 °F) during the hottest month nearly everywhere in the desert except at very high altitudes. The world's highest officially recorded average daily high temperature[clarification needed] was 47 °C (116.6 °F) in a remote desert town in the Algerian Desert called Bou Bernous, at an elevation of 378 metres (1,240 ft) above sea level, and only Death Valley, California rivals it.
Other hot spots in Algeria such as Adrar, Timimoun, In Salah, Ouallene, Aoulef, Reggane with an elevation between 200 and 400 metres (660 and 1,310 ft) above sea level get slightly lower summer average highs, around 46 °C (114.8 °F) during the hottest months of the year. Salah, well known in Algeria for its extreme heat, has average high temperatures of 43.8 °C (110.8 °F), 46.4 °C (115.5 °F), 45.5 °C (113.9 °F) and 41.9 °C (107.4 °F) in June, July, August and September respectively. There are even hotter spots in the Sahara, but they are located in extremely remote areas, especially in the Azalai, lying in northern Mali. The major part of the desert experiences around three to five months when the average high strictly[clarification needed] exceeds 40 °C (104 °F); while in the southern central part of the desert, there are up to six or seven months when the average high temperature strictly[clarification needed] exceeds 40 °C (104 °F). Some examples of this are Bilma, Niger and Faya-Largeau, Chad. The annual average daily temperature exceeds 20 °C (68 °F) everywhere and can approach 30 °C (86 °F) in the hottest regions year-round. However, most of the desert has a value in excess of 25 °C (77 °F).
Sand and ground temperatures are even more extreme. During daytime, the sand temperature is extremely high: it can easily reach 80 °C (176 °F) or more. A sand temperature of 83.5 °C (182.3 °F) has been recorded in Port Sudan. Ground temperatures of 72 °C (161.6 °F) have been recorded in the Adrar of Mauritania and a value of 75 °C (167 °F) has been measured in Borkou, northern Chad.
Due to lack of cloud cover and very low humidity, the desert usually has high diurnal temperature variations between days and nights. However, it is a myth that the nights are especially cold after extremely hot days in the Sahara.[citation needed] On average, nighttime temperatures tend to be 13–20 °C (23–36 °F) cooler than in the daytime. The smallest variations are found along the coastal regions due to high humidity and are often even lower than a 10 °C (18 °F) difference, while the largest variations are found in inland desert areas where the humidity is the lowest, mainly in the southern Sahara. Still, it is true that winter nights can be cold, as it can drop to the freezing point and even below, especially in high-elevation areas.[clarification needed] The frequency of subfreezing winter nights in the Sahara is strongly influenced by the North Atlantic Oscillation (NAO), with warmer winter temperatures during negative NAO events and cooler winters with more frosts when the NAO is positive. This is because the weaker clockwise flow around the eastern side of the subtropical anticyclone during negative NAO winters, although too dry to produce more than negligible precipitation, does reduce the flow of dry, cold air from higher latitudes of Eurasia into the Sahara significantly.
Precipitation
The average annual rainfall ranges from very low in the northern and southern fringes of the desert to nearly non-existent over the central and the eastern part. The thin northern fringe of the desert receives more winter cloudiness and rainfall due to the arrival of low pressure systems over the Mediterranean Sea along the polar front, although very attenuated by the rain shadow effects of the mountains and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Biskra, Algeria, and Ouarzazate, Morocco, are found in this zone. The southern fringe of the desert along the border with the Sahel receives summer cloudiness and rainfall due to the arrival of the Intertropical Convergence Zone from the south and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Timbuktu, Mali and Agadez, Niger are found in this zone.
The vast central hyper-arid core of the desert is virtually never affected by northerly or southerly atmospheric disturbances and permanently remains under the influence of the strongest anticyclonic weather regime, and the annual average rainfall can drop to less than 1 millimetre (0.04 in). In fact, most of the Sahara receives less than 20 millimetres (0.8 in). Of the 9,000,000 square kilometres (3,500,000 sq mi) of desert land in the Sahara, an area of about 2,800,000 square kilometres (1,100,000 sq mi) (about 31% of the total area) receives an annual average rainfall amount of 10 millimetres (0.4 in) or less, while some 1,500,000 square kilometres (580,000 sq mi) (about 17% of the total area) receives an average of 5 millimetres (0.2 in) or less.
The annual average rainfall is virtually zero over a wide area of some 1,000,000 square kilometres (390,000 sq mi) in the eastern Sahara comprising deserts of: Libya, Egypt and Sudan (Tazirbu, Kufra, Dakhla, Kharga, Farafra, Siwa, Asyut, Sohag, Luxor, Aswan, Abu Simbel, Wadi Halfa) where the long-term mean approximates 0.5 millimetres (0.02 in) per year.[25] Rainfall is very unreliable and erratic in the Sahara as it may vary considerably year by year. In full contrast to the negligible annual rainfall amounts, the annual rates of potential evaporation are extraordinarily high, roughly ranging from 2,500 millimetres (100 in) per year to more than 6,000 millimetres (240 in) per year in the whole desert. Nowhere else on Earth has air been found as dry and evaporative as in the Sahara region. However, at least two instances of snowfall have been recorded in Sahara, in February 1979 and December 2016, both in the town of Ain Sefra.
Desertification and prehistoric climate
One theory for the formation of the Sahara is that the monsoon in Northern Africa was weakened because of glaciation during the Quaternary period, starting two or three million years ago. Another theory is that the monsoon was weakened when the ancient Tethys Sea dried up during the Tortonian period around 7 million years ago.
The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years, believed to be caused by long-term changes in the North African climate cycle that alters the path of the North African Monsoon – usually southward. The cycle is caused by a 41,000-year cycle in which the tilt of the earth changes between 22° and 24.5°. At present, we are in a dry period, but it is expected that the Sahara will become green again in 15,000 years. When the North African monsoon is at its strongest, annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green Sahara". For a relatively weak North African monsoon, the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the "desert Sahara".
The idea that changes in insolation (solar heating) caused by long-term changes in Earth's orbit are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century, The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. Kutzbach's ideas about the impacts of insolation on global monsoonal patterns have become widely accepted today as the underlying driver of long-term monsoonal cycles. Kutzbach never formally named his hypothesis and as such it is referred to here as the "Orbital Monsoon Hypothesis" as suggested by Ruddiman in 2001.
During the last glacial period, the Sahara was much larger than it is today, extending south beyond its current boundaries. The end of the glacial period brought more rain to the Sahara, from about 8000 BCE to 6000 BCE, perhaps because of low pressure areas over the collapsing ice sheets to the north. Once the ice sheets were gone, the northern Sahara dried out. In the southern Sahara, the drying trend was initially counteracted by the monsoon, which brought rain further north than it does today. By around 4200 BCE, however, the monsoon retreated south to approximately where it is today, leading to the gradual desertification of the Sahara. The Sahara is now as dry as it was about 13,000 years ago.
Lake Chad is the remnant of a former inland sea, paleolake Mega-Chad, which existed during the African humid period. At its largest extent, sometime before 5000 BCE, Lake Mega-Chad was the largest of four Saharan paleolakes, and is estimated to have covered an area of 350,000 km2.
The Sahara pump theory describes this cycle. During periods of a wet or "Green Sahara", the Sahara becomes a savanna grassland and various flora and fauna become more common. Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains, southwards into West Africa, or eastwards into the Nile Valley. This separates populations of some of the species in areas with different climates, forcing them to adapt, possibly giving rise to allopatric speciation.
September 2020, it was reported that the GGW had only covered 4% of the planned area.
It is also proposed that humans accelerated the drying-out period from 6000 to 2500 BCE by pastoralists overgrazing available grassland.
Evidence for cycles
The growth of speleothems (which requires rainwater) was detected in Hol-Zakh, Ashalim, Even-Sid, Ma'ale-ha-Meyshar, Ktora Cracks, Nagev Tzavoa Cave, and elsewhere, and has allowed tracking of prehistoric rainfall. The Red Sea coastal route was extremely arid before 140 and after 115 kya (thousands of years ago). Slightly wetter conditions appear at 90–87 kya, but it still was just one tenth the rainfall around 125 kya. In the southern Negev Desert speleothems did not grow between 185 and 140 kya (MIS 6), 110–90 (MIS 5.4–5.2), nor after 85 kya nor during most of the interglacial period (MIS 5.1), the glacial period and Holocene. This suggests that the southern Negev was arid-to-hyper-arid in these periods.
During the Last Glacial Maximum (LGM) the Sahara was more extensive than it is now with the extent of the tropical forests being greatly reduced, and the lower temperatures reduced the strength of the Hadley Cell. This is a climate cell which causes rising tropical air of the Inter-Tropical Convergence Zone (ITCZ) to bring rain to the tropics, while dry descending air, at about 20 degrees north, flows back to the equator and brings desert conditions to this region. It is associated with high rates of wind-blown mineral dust, and these dust levels are found as expected in marine cores from the north tropical Atlantic. But around 12,500 BCE the amount of dust in the cores in the Bølling/Allerød phase suddenly plummets and shows a period of much wetter conditions in the Sahara, indicating a Dansgaard-Oeschger (DO) event (a sudden warming followed by a slower cooling of the climate). The moister Saharan conditions had begun about 12,500 BCE, with the extension of the ITCZ northward in the northern hemisphere summer, bringing moist wet conditions and a savanna climate to the Sahara, which (apart from a short dry spell associated with the Younger Dryas) peaked during the Holocene thermal maximum climatic phase at 4000 BCE when mid-latitude temperatures seem to have been between 2 and 3 degrees warmer than in the recent past. Analysis of Nile River deposited sediments in the delta also shows this period had a higher proportion of sediments coming from the Blue Nile, suggesting higher rainfall also in the Ethiopian Highlands. This was caused principally by a stronger monsoonal circulation throughout the sub-tropical regions, affecting India, Arabia and the Sahara.[citation needed] Lake Victoria only recently became the source of the White Nile and dried out almost completely around 15 kya.
The sudden subsequent movement of the ITCZ southwards with a Heinrich event (a sudden cooling followed by a slower warming), linked to changes with the El Niño-Southern Oscillation cycle, led to a rapid drying out of the Saharan and Arabian regions, which quickly became desert. This is linked to a marked decline in the scale of the Nile floods between 2700 and 2100 BCE.
Ecoregions
The Sahara comprises several distinct ecoregions. With their variations in temperature, rainfall, elevation, and soil, these regions harbor distinct communities of plants and animals.
The Atlantic coastal desert is a narrow strip along the Atlantic coast where fog generated offshore by the cool Canary Current provides sufficient moisture to sustain a variety of lichens, succulents, and shrubs. It covers an area of 39,900 square kilometers (15,400 sq mi) in the south of Morocco and Mauritania.
The North Saharan steppe and woodlands is along the northern desert, next to the Mediterranean forests, woodlands, and scrub ecoregions of the northern Maghreb and Cyrenaica. Winter rains sustain shrublands and dry woodlands that form a transition between the Mediterranean climate regions to the north and the hyper-arid Sahara proper to the south. It covers 1,675,300 square kilometers (646,840 sq mi) in Algeria, Egypt, Libya, Mauritania, Morocco, and Tunisia.
The Sahara desert ecoregion covers the hyper-arid central portion of the Sahara where rainfall is minimal and sporadic. Vegetation is rare, and this ecoregion consists mostly of sand dunes (erg, chech, raoui), stone plateaus (hamadas), gravel plains (reg), dry valleys (wadis), and salt flats. It covers 4,639,900 square kilometres (1,791,500 sq mi) of: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, and Sudan.
The South Saharan steppe and woodlands ecoregion is a narrow band running east and west between the hyper-arid Sahara and the Sahel savannas to the south. Movements of the equatorial Intertropical Convergence Zone (ITCZ) bring summer rains during July and August which average 100 to 200 mm (4 to 8 in) but vary greatly from year to year. These rains sustain summer pastures of grasses and herbs, with dry woodlands and shrublands along seasonal watercourses. This ecoregion covers 1,101,700 square kilometres (425,400 sq mi) in Algeria, Chad, Mali, Mauritania, and Sudan.
In the West Saharan montane xeric woodlands, several volcanic highlands provide a cooler, moister environment that supports Saharo-Mediterranean woodlands and shrublands. The ecoregion covers 258,100 square kilometres (99,650 sq mi), mostly in the Tassili n'Ajjer of Algeria, with smaller enclaves in the Aïr of Niger, the Adrar Plateau of Mauritania, and the Adrar des Iforas of Mali and Algeria.
The Tibesti-Jebel Uweinat montane xeric woodlands ecoregion consists of the Tibesti and Jebel Uweinat highlands. Higher and more regular rainfall and cooler temperatures support woodlands and shrublands of date palm, acacias, myrtle, oleander, tamarix, and several rare and endemic plants. The ecoregion covers 82,200 square kilometres (31,700 sq mi) in the Tibesti of Chad and Libya, and Jebel Uweinat on the border of Egypt, Libya, and Sudan.
The Saharan halophytics is an area of seasonally flooded saline depressions which is home to halophytic (salt-adapted) plant communities. The Saharan halophytics cover 54,000 square kilometres (21,000 sq mi) including: the Qattara and Siwa depressions in northern Egypt, the Tunisian salt lakes of central Tunisia, Chott Melghir in Algeria, and smaller areas of Algeria, Mauritania, and the southern part of Morocco.
The Tanezrouft is one of the Sahara's most arid regions, with no vegetation and very little life. A barren, flat gravel plain, it extends south of Reggane in Algeria towards the Adrar des Ifoghas highlands in northern Mali.
Flora and fauna
The flora of the Sahara is highly diversified based on the bio-geographical characteristics of this vast desert. Floristically, the Sahara has three zones based on the amount of rainfall received – the Northern (Mediterranean), Central and Southern Zones. There are two transitional zones – the Mediterranean-Sahara transition and the Sahel transition zone.
The Saharan flora comprises around 2800 species of vascular plants. Approximately a quarter of these are endemic. About half of these species are common to the flora of the Arabian deserts.
The central Sahara is estimated to include five hundred species of plants, which is extremely low considering the huge extent of the area. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture, and by having small thick leaves or needles to prevent water loss by evapotranspiration. Plant leaves may dry out totally and then recover.
Several species of fox live in the Sahara including: the fennec fox, pale fox and Rüppell's fox. The addax, a large white antelope, can go nearly a year in the desert without drinking. The dorcas gazelle is a north African gazelle that can also go for a long time without water. Other notable gazelles include the rhim gazelle and dama gazelle.
The Saharan cheetah (northwest African cheetah) lives in Algeria, Togo, Niger, Mali, Benin, and Burkina Faso. There remain fewer than 250 mature cheetahs, which are very cautious, fleeing any human presence. The cheetah avoids the sun from April to October, seeking the shelter of shrubs such as balanites and acacias. They are unusually pale. The other cheetah subspecies (northeast African cheetah) lives in Chad, Sudan and the eastern region of Niger. However, it is currently extinct in the wild in Egypt and Libya. There are approximately 2000 mature individuals left in the wild.
Other animals include the monitor lizards, hyrax, sand vipers, and small populations of African wild dog, in perhaps only 14 countries and red-necked ostrich. Other animals exist in the Sahara (birds in particular) such as African silverbill and black-faced firefinch, among others. There are also small desert crocodiles in Mauritania and the Ennedi Plateau of Chad.
The deathstalker scorpion can be 10 cm (3.9 in) long. Its venom contains large amounts of agitoxin and scyllatoxin and is very dangerous; however, a sting from this scorpion rarely kills a healthy adult. The Saharan silver ant is unique in that due to the extreme high temperatures of their habitat, and the threat of predators, the ants are active outside their nest for only about ten minutes per day.
Dromedary camels and goats are the domesticated animals most commonly found in the Sahara. Because of its qualities of endurance and speed, the dromedary is the favourite animal used by nomads.
Human activities are more likely to affect the habitat in areas of permanent water (oases) or where water comes close to the surface. Here, the local pressure on natural resources can be intense. The remaining populations of large mammals have been greatly reduced by hunting for food and recreation. In recent years development projects have started in the deserts of Algeria and Tunisia using irrigated water pumped from underground aquifers. These schemes often lead to soil degradation and salinization.
Researchers from Hacettepe University have reported that Saharan soil may have bio-available iron and also some essential macro and micro nutrient elements suitable for use as fertilizer for growing wheat.
History
People lived on the edge of the desert thousands of years ago, since the end of the last glacial period. In the Central Sahara, engraved and painted rock art were created perhaps as early as 10,000 years ago, spanning the Bubaline Period, Kel Essuf Period, Round Head Period, Pastoral Period, Caballine Period, and Cameline Period. The Sahara was then a much wetter place than it is today. Over 30,000 petroglyphs of river animals such as crocodiles survive, with half found in the Tassili n'Ajjer in southeast Algeria. Fossils of dinosaurs, including Afrovenator, Jobaria and Ouranosaurus, have also been found here. The modern Sahara, though, is not lush in vegetation, except in the Nile Valley, at a few oases, and in the northern highlands, where Mediterranean plants such as the olive tree are found to grow. Shifts in Earth's axis increased temperatures and decreased precipitation, which caused an abrupt beginning of North Africa desertification about 5,400 years ago.
Kiffians
The Kiffian culture is a prehistoric industry, or domain, that existed between 10,000 and 8,000 years ago in the Sahara, during the Neolithic Subpluvial. Human remains from this culture were found in 2000 at a site known as Gobero, located in Niger in the Ténéré Desert. The site is known as the largest and earliest grave of Stone Age people in the Sahara. The Kiffians were skilled hunters. Bones of many large savannah animals that were discovered in the same area suggest that they lived on the shores of a lake that was present during the Holocene Wet Phase, a period when the Sahara was verdant and wet. The Kiffian people were tall, standing over six feet in height. Craniometric analysis indicates that this early Holocene population was closely related to the Late Pleistocene Iberomaurusians and early Holocene Capsians of the Maghreb, as well as mid-Holocene Mechta groups. Traces of the Kiffian culture do not exist after 8,000 years ago, as the Sahara went through a dry period for the next thousand years. After this time, the Tenerian culture colonized the area.
Tenerians
Gobero was discovered in 2000 during an archaeological expedition led by Paul Sereno, which sought dinosaur remains. Two distinct prehistoric cultures were discovered at the site: the early Holocene Kiffian culture, and the middle Holocene Tenerian culture. The post-Kiffian desiccation lasted until around 4600 BCE, when the earliest artefacts associated with the Tenerians have been dated to. Some 200 skeletons have been discovered at Gobero. The Tenerians were considerably shorter in height and less robust than the earlier Kiffians. Craniometric analysis also indicates that they were osteologically distinct. The Kiffian skulls are akin to those of the Late Pleistocene Iberomaurusians, early Holocene Capsians, and mid-Holocene Mechta groups, whereas the Tenerian crania are more like those of Mediterranean groups. Graves show that the Tenerians observed spiritual traditions, as they were buried with artifacts such as jewelry made of hippo tusks and clay pots. The most interesting find is a triple burial, dated to 5300 years ago, of an adult female and two children, estimated through their teeth as being five and eight years old, hugging each other. Pollen residue indicates they were buried on a bed of flowers. The three are assumed to have died within 24 hours of each other, but as their skeletons hold no apparent trauma (they did not die violently) and they have been buried so elaborately – unlikely if they had died of a plague – the cause of their deaths is a mystery.
Tashwinat Mummy
Uan Muhuggiag appears to have been inhabited from at least the 6th millennium BCE to about 2700 BCE, although not necessarily continuously. The most noteworthy find at Uan Muhuggiag is the well-preserved mummy of a young boy of approximately 2+1⁄2 years old. The child was in a fetal position, then embalmed, then placed in a sack made of antelope skin, which was insulated by a layer of leaves. The boy's organs were removed, as evidenced by incisions in his stomach and thorax, and an organic preservative was inserted to stop his body from decomposing. An ostrich eggshell necklace was also found around his neck. Radiocarbon dating determined the age of the mummy to be approximately 5600 years old, which makes it about 1000 years older than the earliest previously recorded mummy in ancient Egypt. In 1958–59, an archaeological expedition led by Antonio Ascenzi conducted anthropological, radiological, histological and chemical analyses on the Uan Muhuggiag mummy. The team claimed that the mummy was a 30-month-old child of uncertain sex. They also found a long incision on the specimen's abdominal wall, which indicated that the body had been initially mummified by evisceration and later underwent natural desiccation. The team also stated that the mummy possessed "Negroid features." However, modern genetics has since proven that the final claim is unscientific and not supported by evidence. A more recent publication referenced a laboratory examination of the cutaneous features of the child mummy in which the results verified that the child possessed a dark skin complexion. One other individual, an adult, was found at Uan Muhuggiag, buried in a crouched position. However, the body showed no evidence of evisceration or any other method of preservation. The body was estimated to date from about 7500 BP.
Nubians
During the Neolithic Era, before the onset of desertification around 9500 BCE, the central Sudan had been a rich environment supporting a large population ranging across what is now barren desert, like the Wadi el-Qa'ab. By the 5th millennium BCE, the people who inhabited what is now called Nubia were full participants in the "agricultural revolution", living a settled lifestyle with domesticated plants and animals. Saharan rock art of cattle and herdsmen suggests the presence of a cattle cult like those found in Sudan and other pastoral societies in Africa today. Megaliths found at Nabta Playa are overt examples of probably the world's first known archaeoastronomy devices, predating Stonehenge by some 2,000 years. This complexity, as observed at Nabta Playa, and as expressed by different levels of authority within the society there, likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt. Archaeological evidence has attested that population settlements occurred in Nubia as early as the Late Pleistocene era and from the 5th millennium BC onwards, whereas there is "no or scanty evidence" of human presence in the Egyptian Nile Valley during these periods, which may be due to problems in site preservation.
Egyptians
By 6000 BCE predynastic Egyptians in the southwestern corner of Egypt were herding cattle and constructing large buildings. Subsistence in organized and permanent settlements in predynastic Egypt by the middle of the 6th millennium BCE centered predominantly on cereal and animal agriculture: cattle, goats, pigs and sheep. Metal objects replaced prior ones of stone. Tanning of animal skins, pottery and weaving were commonplace in this era also. There are indications of seasonal or only temporary occupation of the Al Fayyum in the 6th millennium BCE, with food activities centering on fishing, hunting and food-gathering. Stone arrowheads, knives and scrapers from the era are commonly found. Burial items included pottery, jewelry, farming and hunting equipment, and assorted foods including dried meat and fruit. Burial in desert environments appears to enhance Egyptian preservation rites, and the dead were buried facing due west. Several scholars have argued that the African origins of the Egyptian civilisation derived from pastoral communities which emerged in both the Egyptian and Sudanese regions of the Nile Valley in the fifth millennium BCE.
By 3400 BCE, the Sahara was as dry as it is today, due to reduced precipitation and higher temperatures resulting from a shift in Earth's orbit. As a result of this aridification, it became a largely impenetrable barrier to humans, with the remaining settlements mainly being concentrated around the numerous oases that dot the landscape. Little trade or commerce is known to have passed through the interior in subsequent periods, the only major exception being the Nile Valley. The Nile, however, was impassable at several cataracts, making trade and contact by boat difficult.
Tichitt culture
In 4000 BCE, the start of sophisticated social structure (e.g., trade of cattle as valued assets) developed among herders amid the Pastoral Period of the Sahara. Saharan pastoral culture (e.g., fields of tumuli, lustrous stone rings, axes) was intricate. By 1800 BCE, Saharan pastoral culture expanded throughout the Saharan and Sahelian regions. The initial stages of sophisticated social structure among Saharan herders served as the segue for the development of sophisticated hierarchies found in African settlements, such as Dhar Tichitt. After migrating from the Central Sahara, proto-Mande peoples established their civilization in the Tichitt region of the Western Sahara[88] The Tichitt Tradition of eastern Mauritania dates from 2200 BCE[89][90] to 200 BCE. Tichitt culture, at Dhar Néma, Dhar Tagant, Dhar Tichitt, and Dhar Walata, included a four-tiered hierarchal social structure, farming of cereals, metallurgy, numerous funerary tombs, and a rock art tradition At Dhar Tichitt and Dhar Walata, pearl millet may have also been independently tamed amid the Neolithic. Dhar Tichitt, which includes Dakhlet el Atrouss, may have served as the primary regional center for the multi-tiered hierarchical social structure of the Tichitt Tradition, and the Malian Lakes Region, which includes Tondidarou, may have served as a second regional center of the Tichitt Tradition. The urban Tichitt Tradition may have been the earliest large-scale, complexly organized society in West Africa, and an early civilization of the Sahara, which may have served as the segue for state formation in West Africa.
As areas where the Tichitt cultural tradition were present, Dhar Tichitt and Dhar Walata were occupied more frequently than Dhar Néma. Farming of crops (e.g., millet) may have been a feature of the Tichitt cultural tradition as early as 3rd millennium BCE in Dhar Tichitt.
As part of a broader trend of iron metallurgy developed in the West African Sahel amid 1st millennium BCE, iron items (350 BCE – 100 CE) were found at Dhar Tagant, iron metalworking and/or items (800 BCE – 400 BCE) were found at Dia Shoma and Walaldé, and the iron remnants (760 BCE – 400 BCE) found at Bou Khzama and Djiganyai. The iron materials that were found are evidence of iron metalworking at Dhar Tagant. In the late period of the Tichitt Tradition at Dhar Néma, tamed pearl millet was used to temper the tuyeres of a oval-shaped low shaft furnace; this furnace was one out of 16 iron furnaces located on elevated ground. Iron metallurgy may have developed before the second half of 1st millennium BCE, as indicated by pottery dated between 800 BCE and 200 BCE. At Dhar Walata and Dhar Tichitt, copper was also used.
After its decline in Mauritania, the Tichitt Tradition spread to the Middle Niger region (e.g., Méma, Macina, Dia Shoma, Jenne Jeno) of Mali where it developed into and persisted as Faïta Facies ceramics between 1300 BCE and 400 BCE among rammed earth architecture and iron metallurgy (which had developed after 900 BCE). Thereafter, the Ghana Empire developed in the 1st millennium CE.
Phoenicians
The people of Phoenicia, who flourished from 1200 to 800 BCE, created a chain of settlements along the coast of North Africa and traded extensively with its inhabitants. This put them in contact with the people of ancient Libya, who were the ancestors of people who speak Berber languages in North Africa and the Sahara today.
The Libyco-Berber alphabet of the ancient Libyans of north Africa seems to have been based on Phoenician, and its descendant Tifinagh is still used today by the (Berber) Tuareg of the central Sahara.
The Periplus of the Phoenician navigator Hanno, who lived sometime in the 5th century BC, claims that he founded settlements along the Atlantic coast of Africa, possibly including the Western Sahara. The identification of the places discussed is controversial, and archeological confirmation is lacking.
Greeks
By 500 BCE, Greeks arrived in the desert. Greek traders spread along the eastern coast of the desert, establishing trading colonies along the Red Sea. The Carthaginians explored the Atlantic coast of the desert, but the turbulence of the waters and the lack of markets caused a lack of presence further south than modern Morocco. Centralized states thus surrounded the desert on the north and east; it remained outside the control of these states. Raids from the nomadic Berber people of the desert were of constant concern to those living on the edge of the desert.
Garamantes
An urban civilization, the Garamantes, arose around 500 BCE in the heart of the Sahara, in a valley that is now called the Wadi al-Ajal in Fezzan, Libya. The Garamantes built a prosperous empire in the heart of the desert. The Garamantes achieved this development by digging tunnels far into the mountains flanking the valley to tap fossil water and bring it to their fields. The Garamantes grew populous and strong, conquering their neighbors, and capturing and enslaving many individuals who were forced to work by extending the tunnels. The ancient Greeks and the Romans knew of the Garamantes and regarded them as uncivilized nomads. However, they traded with them, and a Roman bath has been found in the Garamantes' capital of Garama. Archaeologists have found eight major towns and many other important settlements in the Garamantes' territory. The Garamantes' civilization eventually collapsed after they had depleted available water in the aquifers and could no longer sustain the effort to extend the tunnels further into the mountains.
Between the first century BCE and the fourth century CE, several Roman expeditions into the Sahara were conducted by groups of military and commercial units of Romans.
Islamic and Arabic expansion
Main articles: Trans-Saharan trade and Islamization of Sudan
The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia, specifically the Arabian peninsula, the Muslim conquest of North Africa began in the mid-7th to early 8th centuries and Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. Trade across the desert intensified, and a significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
The Beni Ḥassān and other nomadic Arab tribes dominated the Sanhaja Berber tribes of the western Sahara after the Char Bouba war of the 17th century. As a result, Arabian culture and language came to dominate, and the Berber tribes underwent some Arabization.
Ottoman Turkish era
In the 16th century the northern fringe of the Sahara, such as coastal regencies in present-day Algeria and Tunisia, as well as some parts of present-day Libya, together with the semi-autonomous kingdom of Egypt, were occupied by the Ottoman Empire. From 1517 Egypt was a valued part of the Ottoman Empire, ownership of which provided the Ottomans with control over the Nile Valley, the east Mediterranean and North Africa. The benefit of the Ottoman Empire was the freedom of movement for citizens and goods. Traders exploited the Ottoman land routes to handle the spices, gold and silk from the East, manufactured goods from Europe, and the slave and gold traffic from Africa. Arabic continued as the local language and Islamic culture was much reinforced. The Sahel and southern Sahara regions were home to several independent states or to roaming Tuareg clans.
European colonialism
European colonialism in the Sahara began in the 19th century. France conquered the regency of Algiers from the Ottomans in 1830, and French rule spread south from French Algeria and eastwards from Senegal into the upper Niger to include present-day Algeria, Chad, Mali then French Sudan including Timbuktu (1893), Mauritania, Morocco (1912), Niger, and Tunisia (1881). By the beginning of the 20th century, the trans-Saharan trade had clearly declined because goods were moved through more modern and efficient means, such as airplanes, rather than across the desert.
The French took advantage of long-standing animosity between the Chaamba Arabs and the Tuareg. The newly raised Méhariste camel corps were originally recruited mainly from the Chaamba nomadic tribe. In 1902, the French penetrated the Hoggar mountains and defeated Ahaggar Tuareg in the battle of Tit.
The French Colonial Empire was the dominant presence in the Sahara. It established regular air links from Toulouse (HQ of famed Aéropostale), to Oran and over the Hoggar to Timbuktu and West to Bamako and Dakar, as well as trans-Sahara bus services run by La Compagnie Transsaharienne (est. 1927). A remarkable film shot by famous aviator Captain René Wauthier in 1933 documents the first crossing by a large truck convoy from Algiers to Tchad, across the Sahara.
Egypt, under Muhammad Ali and his successors, conquered Nubia in 1820–22, founded Khartoum in 1823, and conquered Darfur in 1874. Egypt, including Sudan, became a British protectorate in 1882. Egypt and Britain lost control of the Sudan from 1882 to 1898 as a result of the Mahdist War. After its capture by British troops in 1898, the Sudan became an Anglo-Egyptian condominium.
Spain captured present-day Western Sahara after 1874, although Rio del Oro remained largely under Sahrawi influence. In 1912, Italy captured parts of what was to be named Libya from the Ottomans. To promote the Roman Catholic religion in the desert, Pope Pius IX appointed a delegate Apostolic of the Sahara and the Sudan in 1868; later in the 19th century his jurisdiction was reorganized into the Vicariate Apostolic of Sahara.
Egypt became independent of Britain in 1936, although the Anglo-Egyptian treaty of 1936 allowed Britain to keep troops in Egypt and to maintain the British-Egyptian condominium in the Sudan. British military forces were withdrawn in 1954.
Most of the Saharan states achieved independence after World War II: Libya in 1951; Morocco, Sudan, and Tunisia in 1956; Chad, Mali, Mauritania, and Niger in 1960; and Algeria in 1962. Spain withdrew from Western Sahara in 1975, and it was partitioned between Mauritania and Morocco. Mauritania withdrew in 1979; Morocco continues to hold the territory (see Western Sahara conflict).
Tuareg people in Mali rebelled several times during the 20th century before finally forcing the Malian armed forces to withdraw below the line demarcating Azawad from southern Mali during the 2012 rebellion. Islamist rebels in the Sahara calling themselves al-Qaeda in the Islamic Maghreb have stepped up their violence in recent years.
In the post–World War II era, several mines and communities have developed to use the desert's natural resources. These include large deposits of oil and natural gas in Algeria and Libya, and large deposits of phosphates in Morocco and Western Sahara. Libya's Great Man-Made River is the world's largest irrigation project. The project uses a pipeline system that pumps fossil water from the Nubian Sandstone Aquifer System to cities in the populous Libyan northern Mediterranean coast including Tripoli and Benghazi.
A number of Trans-African highways have been proposed across the Sahara, including the Cairo–Dakar Highway along the Atlantic coast, the Trans-Sahara Highway from Algiers on the Mediterranean to Kano in Nigeria, the Tripoli – Cape Town Highway from Tripoli in Libya to N'Djamena in Chad, and the Cairo – Cape Town Highway which follows the Nile. Each of these highways is partially complete, with significant gaps and unpaved sections.
People, culture, and languages
A 19th-century engraving of an Arab slave-trading caravan transporting black African slaves across the Sahara
The people of the Sahara are of various origins. Among them the Amazigh including the Tuareg, various Arabized Amaziɣ groups such as the Hassaniya-speaking Sahrawis, whose populations include the Znaga, a tribe whose name is a remnant of the pre-historic Zenaga language. Other major groups of people include the: Toubou, Nubians, Zaghawa, Kanuri, Hausa, Songhai, Beja, and Fula/Fulani (French: Peul; Fula: Fulɓe). The archaeological evidence from the Holocene period has shown that Nilo-Saharan speaking groups had populated the central and southern Sahara before the influx of Berber and Arabic speakers, around 1500 years ago, who now largely populate the Sahara in the modern era.
Arabic dialects are the most widely spoken languages in the Sahara. Arabic, Berber and its variants now regrouped under the term Amazigh (which includes the Guanche language spoken by the original Berber inhabitants of the Canary Islands) and Beja languages are part of the Afro-Asiatic or Hamito-Semitic family.[citation needed] Unlike neighboring West Africa and the central governments of the states that comprise the Sahara, the French language bears little relevance to inter-personal discourse and commerce within the region, its people retaining staunch ethnic and political affiliations with Tuareg and Berber leaders and culture. The legacy of the French colonial era administration is primarily manifested in the territorial reorganization enacted by the Third and Fourth republics, which engendered artificial political divisions within a hitherto isolated and porous region.[113] Diplomacy with local clients was conducted primarily in Arabic, which was the traditional language of bureaucratic affairs. Mediation of disputes and inter-agency communication was served by interpreters contracted by the French government, who, according to Keenan, "documented a space of intercultural mediation," contributing much to preserving the indigenous cultural identities in the region.
The Sahara (/səˈhɑːrə/, /səˈhærə/) is a desert spanning across North Africa. With an area of 9,200,000 square kilometres (3,600,000 sq mi), it is the largest hot desert in the world and the third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic.
The name "Sahara" is derived from Arabic: صَحَارَى, romanized: ṣaḥārā /sˤaħaːraː/, a broken plural form of ṣaḥrā' (صَحْرَاء /sˤaħraːʔ/), meaning "desert".
The desert covers much of North Africa, excluding the fertile region on the Mediterranean Sea coast, the Atlas Mountains of the Maghreb, and the Nile Valley in Egypt and the Sudan.
It stretches from the Red Sea in the east and the Mediterranean in the north to the Atlantic Ocean in the west, where the landscape gradually changes from desert to coastal plains. To the south it is bounded by the Sahel, a belt of semi-arid tropical savanna around the Niger River valley and the Sudan region of sub-Saharan Africa. The Sahara can be divided into several regions, including the western Sahara, the central Ahaggar Mountains, the Tibesti Mountains, the Aïr Mountains, the Ténéré desert, and the Libyan Desert.
For several hundred thousand years, the Sahara has alternated between desert and savanna grassland in a 20,000-year cycle caused by the precession of Earth's axis (about 26,000 years) as it rotates around the Sun, which changes the location of the North African monsoon.
Geography
The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. It covers 9 million square kilometres (3,500,000 sq mi), amounting to 31% of Africa. If all areas with a mean annual precipitation of less than 250 mm (9.8 in) were included, the Sahara would be 11 million square kilometres (4,200,000 sq mi). It is one of three distinct physiographic provinces of the African massive physiographic division. Sahara is so large and bright that, in theory, it could be detected from other stars as a surface feature of Earth, with near-current technology.
The Sahara is mainly rocky hamada (stone plateaus); ergs (sand seas – large areas covered with sand dunes) form only a minor part, but many of the sand dunes are over 180 metres (590 ft) high. Wind or rare rainfall shape the desert features: sand dunes, dune fields, sand seas, stone plateaus, gravel plains (reg), dry valleys (wadi), dry lakes (oued), and salt flats (shatt or chott). Unusual landforms include the Richat Structure in Mauritania.
Several deeply dissected mountains, many volcanic, rise from the desert, including the Aïr Mountains, Ahaggar Mountains, Saharan Atlas, Tibesti Mountains, Adrar des Iforas, and the Red Sea Hills. The highest peak in the Sahara is Emi Koussi, a shield volcano in the Tibesti range of northern Chad.
The central Sahara is hyperarid, with sparse vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub, with trees and taller shrubs in wadis, where moisture collects. In the central, hyperarid region, there are many subdivisions of the great desert: Tanezrouft, the Ténéré, the Libyan Desert, the Eastern Desert, the Nubian Desert and others. These extremely arid areas often receive no rain for years.
To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb, the Sahara borders the Mediterranean forest, woodland, and scrub eco-regions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White and geographer Robert Capot-Rey, the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto, a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The northern limit also corresponds to the 100 mm (3.9 in) isohyet of annual precipitation.
To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Important cities located in the Sahara include Nouakchott, the capital of Mauritania; Tamanrasset, Ouargla, Béchar, Hassi Messaoud, Ghardaïa, and El Oued in Algeria; Timbuktu in Mali; Agadez in Niger; Ghat in Libya; and Faya-Largeau in Chad.
Climate
The Sahara is the world's largest hot desert. It is located in the horse latitudes under the subtropical ridge, a significant belt of semi-permanent subtropical warm-core high pressure where the air from the upper troposphere usually descends, warming and drying the lower troposphere and preventing cloud formation.
The permanent absence of clouds allows unhindered light and thermal radiation. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal chance of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The subtropical ridge is the predominant factor that explains the hot desert climate (Köppen climate classification BWh) of this vast region. The descending airflow is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert: this is the sunniest, driest and the most nearly "rainless" place on the planet, rivaling the Atacama Desert, lying in Chile and Peru.
The rainfall inhibition and the dissipation of cloud cover are most accentuated over the eastern section of the Sahara rather than the western. The prevailing air mass lying above the Sahara is the continental tropical (cT) air mass, which is hot and dry. Hot, dry air masses primarily form over the North-African desert from the heating of the vast continental land area, and it affects the whole desert during most of the year. Because of this extreme heating process, a thermal low is usually noticed near the surface, and is the strongest and the most developed during the summertime. The Sahara High represents the eastern continental extension of the Azores High, centered over the North Atlantic Ocean. The subsidence of the Sahara High nearly reaches the ground during the coolest part of the year, while it is confined to the upper troposphere during the hottest periods.
The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by its geographical configuration and location. Indeed, the extreme aridity of the Sahara is not only explained by the subtropical high pressure: the Atlas Mountains of Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier, causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates.
The primary source of rain in the Sahara is the Intertropical Convergence Zone, a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and southern Sahara. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by: extremely low, unreliable, highly erratic rainfall; extremely high sunshine duration values; high temperatures year-round; negligible rates of relative humidity; a significant diurnal temperature variation; and extremely high levels of potential evaporation which are the highest recorded worldwide.
Temperature
The sky is usually clear above the desert, and the sunshine duration is extremely high everywhere in the Sahara. Most of the desert has more than 3,600 hours of bright sunshine per year (over 82% of daylight hours), and a wide area in the eastern part has over 4,000 hours of bright sunshine per year (over 91% of daylight hours). The highest values are very close to the theoretical maximum value. A value of 4300 hours (98%) of the time would be[clarification needed] recorded in Upper Egypt (Aswan, Luxor) and in the Nubian Desert (Wadi Halfa). The annual average direct solar irradiation is around 2,800 kWh/(m2 year) in the Great Desert. The Sahara has a huge potential for solar energy production.
The high position of the Sun, the extremely low relative humidity, and the lack of vegetation and rainfall make the Great Desert the hottest large region in the world, and the hottest place on Earth during summer in some spots. The average high temperature exceeds 38 to 40 °C (100.4 to 104.0 °F) during the hottest month nearly everywhere in the desert except at very high altitudes. The world's highest officially recorded average daily high temperature[clarification needed] was 47 °C (116.6 °F) in a remote desert town in the Algerian Desert called Bou Bernous, at an elevation of 378 metres (1,240 ft) above sea level, and only Death Valley, California rivals it.
Other hot spots in Algeria such as Adrar, Timimoun, In Salah, Ouallene, Aoulef, Reggane with an elevation between 200 and 400 metres (660 and 1,310 ft) above sea level get slightly lower summer average highs, around 46 °C (114.8 °F) during the hottest months of the year. Salah, well known in Algeria for its extreme heat, has average high temperatures of 43.8 °C (110.8 °F), 46.4 °C (115.5 °F), 45.5 °C (113.9 °F) and 41.9 °C (107.4 °F) in June, July, August and September respectively. There are even hotter spots in the Sahara, but they are located in extremely remote areas, especially in the Azalai, lying in northern Mali. The major part of the desert experiences around three to five months when the average high strictly[clarification needed] exceeds 40 °C (104 °F); while in the southern central part of the desert, there are up to six or seven months when the average high temperature strictly[clarification needed] exceeds 40 °C (104 °F). Some examples of this are Bilma, Niger and Faya-Largeau, Chad. The annual average daily temperature exceeds 20 °C (68 °F) everywhere and can approach 30 °C (86 °F) in the hottest regions year-round. However, most of the desert has a value in excess of 25 °C (77 °F).
Sand and ground temperatures are even more extreme. During daytime, the sand temperature is extremely high: it can easily reach 80 °C (176 °F) or more. A sand temperature of 83.5 °C (182.3 °F) has been recorded in Port Sudan. Ground temperatures of 72 °C (161.6 °F) have been recorded in the Adrar of Mauritania and a value of 75 °C (167 °F) has been measured in Borkou, northern Chad.
Due to lack of cloud cover and very low humidity, the desert usually has high diurnal temperature variations between days and nights. However, it is a myth that the nights are especially cold after extremely hot days in the Sahara.[citation needed] On average, nighttime temperatures tend to be 13–20 °C (23–36 °F) cooler than in the daytime. The smallest variations are found along the coastal regions due to high humidity and are often even lower than a 10 °C (18 °F) difference, while the largest variations are found in inland desert areas where the humidity is the lowest, mainly in the southern Sahara. Still, it is true that winter nights can be cold, as it can drop to the freezing point and even below, especially in high-elevation areas.[clarification needed] The frequency of subfreezing winter nights in the Sahara is strongly influenced by the North Atlantic Oscillation (NAO), with warmer winter temperatures during negative NAO events and cooler winters with more frosts when the NAO is positive. This is because the weaker clockwise flow around the eastern side of the subtropical anticyclone during negative NAO winters, although too dry to produce more than negligible precipitation, does reduce the flow of dry, cold air from higher latitudes of Eurasia into the Sahara significantly.
Precipitation
The average annual rainfall ranges from very low in the northern and southern fringes of the desert to nearly non-existent over the central and the eastern part. The thin northern fringe of the desert receives more winter cloudiness and rainfall due to the arrival of low pressure systems over the Mediterranean Sea along the polar front, although very attenuated by the rain shadow effects of the mountains and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Biskra, Algeria, and Ouarzazate, Morocco, are found in this zone. The southern fringe of the desert along the border with the Sahel receives summer cloudiness and rainfall due to the arrival of the Intertropical Convergence Zone from the south and the annual average rainfall ranges from 100 millimetres (4 in) to 250 millimetres (10 in). For example, Timbuktu, Mali and Agadez, Niger are found in this zone.
The vast central hyper-arid core of the desert is virtually never affected by northerly or southerly atmospheric disturbances and permanently remains under the influence of the strongest anticyclonic weather regime, and the annual average rainfall can drop to less than 1 millimetre (0.04 in). In fact, most of the Sahara receives less than 20 millimetres (0.8 in). Of the 9,000,000 square kilometres (3,500,000 sq mi) of desert land in the Sahara, an area of about 2,800,000 square kilometres (1,100,000 sq mi) (about 31% of the total area) receives an annual average rainfall amount of 10 millimetres (0.4 in) or less, while some 1,500,000 square kilometres (580,000 sq mi) (about 17% of the total area) receives an average of 5 millimetres (0.2 in) or less.
The annual average rainfall is virtually zero over a wide area of some 1,000,000 square kilometres (390,000 sq mi) in the eastern Sahara comprising deserts of: Libya, Egypt and Sudan (Tazirbu, Kufra, Dakhla, Kharga, Farafra, Siwa, Asyut, Sohag, Luxor, Aswan, Abu Simbel, Wadi Halfa) where the long-term mean approximates 0.5 millimetres (0.02 in) per year.[25] Rainfall is very unreliable and erratic in the Sahara as it may vary considerably year by year. In full contrast to the negligible annual rainfall amounts, the annual rates of potential evaporation are extraordinarily high, roughly ranging from 2,500 millimetres (100 in) per year to more than 6,000 millimetres (240 in) per year in the whole desert. Nowhere else on Earth has air been found as dry and evaporative as in the Sahara region. However, at least two instances of snowfall have been recorded in Sahara, in February 1979 and December 2016, both in the town of Ain Sefra.
Desertification and prehistoric climate
One theory for the formation of the Sahara is that the monsoon in Northern Africa was weakened because of glaciation during the Quaternary period, starting two or three million years ago. Another theory is that the monsoon was weakened when the ancient Tethys Sea dried up during the Tortonian period around 7 million years ago.
The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years, believed to be caused by long-term changes in the North African climate cycle that alters the path of the North African Monsoon – usually southward. The cycle is caused by a 41,000-year cycle in which the tilt of the earth changes between 22° and 24.5°. At present, we are in a dry period, but it is expected that the Sahara will become green again in 15,000 years. When the North African monsoon is at its strongest, annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the "green Sahara". For a relatively weak North African monsoon, the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the "desert Sahara".
The idea that changes in insolation (solar heating) caused by long-term changes in Earth's orbit are a controlling factor for the long-term variations in the strength of monsoon patterns across the globe was first suggested by Rudolf Spitaler in the late nineteenth century, The hypothesis was later formally proposed and tested by the meteorologist John Kutzbach in 1981. Kutzbach's ideas about the impacts of insolation on global monsoonal patterns have become widely accepted today as the underlying driver of long-term monsoonal cycles. Kutzbach never formally named his hypothesis and as such it is referred to here as the "Orbital Monsoon Hypothesis" as suggested by Ruddiman in 2001.
During the last glacial period, the Sahara was much larger than it is today, extending south beyond its current boundaries. The end of the glacial period brought more rain to the Sahara, from about 8000 BCE to 6000 BCE, perhaps because of low pressure areas over the collapsing ice sheets to the north. Once the ice sheets were gone, the northern Sahara dried out. In the southern Sahara, the drying trend was initially counteracted by the monsoon, which brought rain further north than it does today. By around 4200 BCE, however, the monsoon retreated south to approximately where it is today, leading to the gradual desertification of the Sahara. The Sahara is now as dry as it was about 13,000 years ago.
Lake Chad is the remnant of a former inland sea, paleolake Mega-Chad, which existed during the African humid period. At its largest extent, sometime before 5000 BCE, Lake Mega-Chad was the largest of four Saharan paleolakes, and is estimated to have covered an area of 350,000 km2.
The Sahara pump theory describes this cycle. During periods of a wet or "Green Sahara", the Sahara becomes a savanna grassland and various flora and fauna become more common. Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains, southwards into West Africa, or eastwards into the Nile Valley. This separates populations of some of the species in areas with different climates, forcing them to adapt, possibly giving rise to allopatric speciation.
September 2020, it was reported that the GGW had only covered 4% of the planned area.
It is also proposed that humans accelerated the drying-out period from 6000 to 2500 BCE by pastoralists overgrazing available grassland.
Evidence for cycles
The growth of speleothems (which requires rainwater) was detected in Hol-Zakh, Ashalim, Even-Sid, Ma'ale-ha-Meyshar, Ktora Cracks, Nagev Tzavoa Cave, and elsewhere, and has allowed tracking of prehistoric rainfall. The Red Sea coastal route was extremely arid before 140 and after 115 kya (thousands of years ago). Slightly wetter conditions appear at 90–87 kya, but it still was just one tenth the rainfall around 125 kya. In the southern Negev Desert speleothems did not grow between 185 and 140 kya (MIS 6), 110–90 (MIS 5.4–5.2), nor after 85 kya nor during most of the interglacial period (MIS 5.1), the glacial period and Holocene. This suggests that the southern Negev was arid-to-hyper-arid in these periods.
During the Last Glacial Maximum (LGM) the Sahara was more extensive than it is now with the extent of the tropical forests being greatly reduced, and the lower temperatures reduced the strength of the Hadley Cell. This is a climate cell which causes rising tropical air of the Inter-Tropical Convergence Zone (ITCZ) to bring rain to the tropics, while dry descending air, at about 20 degrees north, flows back to the equator and brings desert conditions to this region. It is associated with high rates of wind-blown mineral dust, and these dust levels are found as expected in marine cores from the north tropical Atlantic. But around 12,500 BCE the amount of dust in the cores in the Bølling/Allerød phase suddenly plummets and shows a period of much wetter conditions in the Sahara, indicating a Dansgaard-Oeschger (DO) event (a sudden warming followed by a slower cooling of the climate). The moister Saharan conditions had begun about 12,500 BCE, with the extension of the ITCZ northward in the northern hemisphere summer, bringing moist wet conditions and a savanna climate to the Sahara, which (apart from a short dry spell associated with the Younger Dryas) peaked during the Holocene thermal maximum climatic phase at 4000 BCE when mid-latitude temperatures seem to have been between 2 and 3 degrees warmer than in the recent past. Analysis of Nile River deposited sediments in the delta also shows this period had a higher proportion of sediments coming from the Blue Nile, suggesting higher rainfall also in the Ethiopian Highlands. This was caused principally by a stronger monsoonal circulation throughout the sub-tropical regions, affecting India, Arabia and the Sahara.[citation needed] Lake Victoria only recently became the source of the White Nile and dried out almost completely around 15 kya.
The sudden subsequent movement of the ITCZ southwards with a Heinrich event (a sudden cooling followed by a slower warming), linked to changes with the El Niño-Southern Oscillation cycle, led to a rapid drying out of the Saharan and Arabian regions, which quickly became desert. This is linked to a marked decline in the scale of the Nile floods between 2700 and 2100 BCE.
Ecoregions
The Sahara comprises several distinct ecoregions. With their variations in temperature, rainfall, elevation, and soil, these regions harbor distinct communities of plants and animals.
The Atlantic coastal desert is a narrow strip along the Atlantic coast where fog generated offshore by the cool Canary Current provides sufficient moisture to sustain a variety of lichens, succulents, and shrubs. It covers an area of 39,900 square kilometers (15,400 sq mi) in the south of Morocco and Mauritania.
The North Saharan steppe and woodlands is along the northern desert, next to the Mediterranean forests, woodlands, and scrub ecoregions of the northern Maghreb and Cyrenaica. Winter rains sustain shrublands and dry woodlands that form a transition between the Mediterranean climate regions to the north and the hyper-arid Sahara proper to the south. It covers 1,675,300 square kilometers (646,840 sq mi) in Algeria, Egypt, Libya, Mauritania, Morocco, and Tunisia.
The Sahara desert ecoregion covers the hyper-arid central portion of the Sahara where rainfall is minimal and sporadic. Vegetation is rare, and this ecoregion consists mostly of sand dunes (erg, chech, raoui), stone plateaus (hamadas), gravel plains (reg), dry valleys (wadis), and salt flats. It covers 4,639,900 square kilometres (1,791,500 sq mi) of: Algeria, Chad, Egypt, Libya, Mali, Mauritania, Niger, and Sudan.
The South Saharan steppe and woodlands ecoregion is a narrow band running east and west between the hyper-arid Sahara and the Sahel savannas to the south. Movements of the equatorial Intertropical Convergence Zone (ITCZ) bring summer rains during July and August which average 100 to 200 mm (4 to 8 in) but vary greatly from year to year. These rains sustain summer pastures of grasses and herbs, with dry woodlands and shrublands along seasonal watercourses. This ecoregion covers 1,101,700 square kilometres (425,400 sq mi) in Algeria, Chad, Mali, Mauritania, and Sudan.
In the West Saharan montane xeric woodlands, several volcanic highlands provide a cooler, moister environment that supports Saharo-Mediterranean woodlands and shrublands. The ecoregion covers 258,100 square kilometres (99,650 sq mi), mostly in the Tassili n'Ajjer of Algeria, with smaller enclaves in the Aïr of Niger, the Adrar Plateau of Mauritania, and the Adrar des Iforas of Mali and Algeria.
The Tibesti-Jebel Uweinat montane xeric woodlands ecoregion consists of the Tibesti and Jebel Uweinat highlands. Higher and more regular rainfall and cooler temperatures support woodlands and shrublands of date palm, acacias, myrtle, oleander, tamarix, and several rare and endemic plants. The ecoregion covers 82,200 square kilometres (31,700 sq mi) in the Tibesti of Chad and Libya, and Jebel Uweinat on the border of Egypt, Libya, and Sudan.
The Saharan halophytics is an area of seasonally flooded saline depressions which is home to halophytic (salt-adapted) plant communities. The Saharan halophytics cover 54,000 square kilometres (21,000 sq mi) including: the Qattara and Siwa depressions in northern Egypt, the Tunisian salt lakes of central Tunisia, Chott Melghir in Algeria, and smaller areas of Algeria, Mauritania, and the southern part of Morocco.
The Tanezrouft is one of the Sahara's most arid regions, with no vegetation and very little life. A barren, flat gravel plain, it extends south of Reggane in Algeria towards the Adrar des Ifoghas highlands in northern Mali.
Flora and fauna
The flora of the Sahara is highly diversified based on the bio-geographical characteristics of this vast desert. Floristically, the Sahara has three zones based on the amount of rainfall received – the Northern (Mediterranean), Central and Southern Zones. There are two transitional zones – the Mediterranean-Sahara transition and the Sahel transition zone.
The Saharan flora comprises around 2800 species of vascular plants. Approximately a quarter of these are endemic. About half of these species are common to the flora of the Arabian deserts.
The central Sahara is estimated to include five hundred species of plants, which is extremely low considering the huge extent of the area. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture, and by having small thick leaves or needles to prevent water loss by evapotranspiration. Plant leaves may dry out totally and then recover.
Several species of fox live in the Sahara including: the fennec fox, pale fox and Rüppell's fox. The addax, a large white antelope, can go nearly a year in the desert without drinking. The dorcas gazelle is a north African gazelle that can also go for a long time without water. Other notable gazelles include the rhim gazelle and dama gazelle.
The Saharan cheetah (northwest African cheetah) lives in Algeria, Togo, Niger, Mali, Benin, and Burkina Faso. There remain fewer than 250 mature cheetahs, which are very cautious, fleeing any human presence. The cheetah avoids the sun from April to October, seeking the shelter of shrubs such as balanites and acacias. They are unusually pale. The other cheetah subspecies (northeast African cheetah) lives in Chad, Sudan and the eastern region of Niger. However, it is currently extinct in the wild in Egypt and Libya. There are approximately 2000 mature individuals left in the wild.
Other animals include the monitor lizards, hyrax, sand vipers, and small populations of African wild dog, in perhaps only 14 countries and red-necked ostrich. Other animals exist in the Sahara (birds in particular) such as African silverbill and black-faced firefinch, among others. There are also small desert crocodiles in Mauritania and the Ennedi Plateau of Chad.
The deathstalker scorpion can be 10 cm (3.9 in) long. Its venom contains large amounts of agitoxin and scyllatoxin and is very dangerous; however, a sting from this scorpion rarely kills a healthy adult. The Saharan silver ant is unique in that due to the extreme high temperatures of their habitat, and the threat of predators, the ants are active outside their nest for only about ten minutes per day.
Dromedary camels and goats are the domesticated animals most commonly found in the Sahara. Because of its qualities of endurance and speed, the dromedary is the favourite animal used by nomads.
Human activities are more likely to affect the habitat in areas of permanent water (oases) or where water comes close to the surface. Here, the local pressure on natural resources can be intense. The remaining populations of large mammals have been greatly reduced by hunting for food and recreation. In recent years development projects have started in the deserts of Algeria and Tunisia using irrigated water pumped from underground aquifers. These schemes often lead to soil degradation and salinization.
Researchers from Hacettepe University have reported that Saharan soil may have bio-available iron and also some essential macro and micro nutrient elements suitable for use as fertilizer for growing wheat.
History
People lived on the edge of the desert thousands of years ago, since the end of the last glacial period. In the Central Sahara, engraved and painted rock art were created perhaps as early as 10,000 years ago, spanning the Bubaline Period, Kel Essuf Period, Round Head Period, Pastoral Period, Caballine Period, and Cameline Period. The Sahara was then a much wetter place than it is today. Over 30,000 petroglyphs of river animals such as crocodiles survive, with half found in the Tassili n'Ajjer in southeast Algeria. Fossils of dinosaurs, including Afrovenator, Jobaria and Ouranosaurus, have also been found here. The modern Sahara, though, is not lush in vegetation, except in the Nile Valley, at a few oases, and in the northern highlands, where Mediterranean plants such as the olive tree are found to grow. Shifts in Earth's axis increased temperatures and decreased precipitation, which caused an abrupt beginning of North Africa desertification about 5,400 years ago.
Kiffians
The Kiffian culture is a prehistoric industry, or domain, that existed between 10,000 and 8,000 years ago in the Sahara, during the Neolithic Subpluvial. Human remains from this culture were found in 2000 at a site known as Gobero, located in Niger in the Ténéré Desert. The site is known as the largest and earliest grave of Stone Age people in the Sahara. The Kiffians were skilled hunters. Bones of many large savannah animals that were discovered in the same area suggest that they lived on the shores of a lake that was present during the Holocene Wet Phase, a period when the Sahara was verdant and wet. The Kiffian people were tall, standing over six feet in height. Craniometric analysis indicates that this early Holocene population was closely related to the Late Pleistocene Iberomaurusians and early Holocene Capsians of the Maghreb, as well as mid-Holocene Mechta groups. Traces of the Kiffian culture do not exist after 8,000 years ago, as the Sahara went through a dry period for the next thousand years. After this time, the Tenerian culture colonized the area.
Tenerians
Gobero was discovered in 2000 during an archaeological expedition led by Paul Sereno, which sought dinosaur remains. Two distinct prehistoric cultures were discovered at the site: the early Holocene Kiffian culture, and the middle Holocene Tenerian culture. The post-Kiffian desiccation lasted until around 4600 BCE, when the earliest artefacts associated with the Tenerians have been dated to. Some 200 skeletons have been discovered at Gobero. The Tenerians were considerably shorter in height and less robust than the earlier Kiffians. Craniometric analysis also indicates that they were osteologically distinct. The Kiffian skulls are akin to those of the Late Pleistocene Iberomaurusians, early Holocene Capsians, and mid-Holocene Mechta groups, whereas the Tenerian crania are more like those of Mediterranean groups. Graves show that the Tenerians observed spiritual traditions, as they were buried with artifacts such as jewelry made of hippo tusks and clay pots. The most interesting find is a triple burial, dated to 5300 years ago, of an adult female and two children, estimated through their teeth as being five and eight years old, hugging each other. Pollen residue indicates they were buried on a bed of flowers. The three are assumed to have died within 24 hours of each other, but as their skeletons hold no apparent trauma (they did not die violently) and they have been buried so elaborately – unlikely if they had died of a plague – the cause of their deaths is a mystery.
Tashwinat Mummy
Uan Muhuggiag appears to have been inhabited from at least the 6th millennium BCE to about 2700 BCE, although not necessarily continuously. The most noteworthy find at Uan Muhuggiag is the well-preserved mummy of a young boy of approximately 2+1⁄2 years old. The child was in a fetal position, then embalmed, then placed in a sack made of antelope skin, which was insulated by a layer of leaves. The boy's organs were removed, as evidenced by incisions in his stomach and thorax, and an organic preservative was inserted to stop his body from decomposing. An ostrich eggshell necklace was also found around his neck. Radiocarbon dating determined the age of the mummy to be approximately 5600 years old, which makes it about 1000 years older than the earliest previously recorded mummy in ancient Egypt. In 1958–59, an archaeological expedition led by Antonio Ascenzi conducted anthropological, radiological, histological and chemical analyses on the Uan Muhuggiag mummy. The team claimed that the mummy was a 30-month-old child of uncertain sex. They also found a long incision on the specimen's abdominal wall, which indicated that the body had been initially mummified by evisceration and later underwent natural desiccation. The team also stated that the mummy possessed "Negroid features." However, modern genetics has since proven that the final claim is unscientific and not supported by evidence. A more recent publication referenced a laboratory examination of the cutaneous features of the child mummy in which the results verified that the child possessed a dark skin complexion. One other individual, an adult, was found at Uan Muhuggiag, buried in a crouched position. However, the body showed no evidence of evisceration or any other method of preservation. The body was estimated to date from about 7500 BP.
Nubians
During the Neolithic Era, before the onset of desertification around 9500 BCE, the central Sudan had been a rich environment supporting a large population ranging across what is now barren desert, like the Wadi el-Qa'ab. By the 5th millennium BCE, the people who inhabited what is now called Nubia were full participants in the "agricultural revolution", living a settled lifestyle with domesticated plants and animals. Saharan rock art of cattle and herdsmen suggests the presence of a cattle cult like those found in Sudan and other pastoral societies in Africa today. Megaliths found at Nabta Playa are overt examples of probably the world's first known archaeoastronomy devices, predating Stonehenge by some 2,000 years. This complexity, as observed at Nabta Playa, and as expressed by different levels of authority within the society there, likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt. Archaeological evidence has attested that population settlements occurred in Nubia as early as the Late Pleistocene era and from the 5th millennium BC onwards, whereas there is "no or scanty evidence" of human presence in the Egyptian Nile Valley during these periods, which may be due to problems in site preservation.
Egyptians
By 6000 BCE predynastic Egyptians in the southwestern corner of Egypt were herding cattle and constructing large buildings. Subsistence in organized and permanent settlements in predynastic Egypt by the middle of the 6th millennium BCE centered predominantly on cereal and animal agriculture: cattle, goats, pigs and sheep. Metal objects replaced prior ones of stone. Tanning of animal skins, pottery and weaving were commonplace in this era also. There are indications of seasonal or only temporary occupation of the Al Fayyum in the 6th millennium BCE, with food activities centering on fishing, hunting and food-gathering. Stone arrowheads, knives and scrapers from the era are commonly found. Burial items included pottery, jewelry, farming and hunting equipment, and assorted foods including dried meat and fruit. Burial in desert environments appears to enhance Egyptian preservation rites, and the dead were buried facing due west. Several scholars have argued that the African origins of the Egyptian civilisation derived from pastoral communities which emerged in both the Egyptian and Sudanese regions of the Nile Valley in the fifth millennium BCE.
By 3400 BCE, the Sahara was as dry as it is today, due to reduced precipitation and higher temperatures resulting from a shift in Earth's orbit. As a result of this aridification, it became a largely impenetrable barrier to humans, with the remaining settlements mainly being concentrated around the numerous oases that dot the landscape. Little trade or commerce is known to have passed through the interior in subsequent periods, the only major exception being the Nile Valley. The Nile, however, was impassable at several cataracts, making trade and contact by boat difficult.
Tichitt culture
In 4000 BCE, the start of sophisticated social structure (e.g., trade of cattle as valued assets) developed among herders amid the Pastoral Period of the Sahara. Saharan pastoral culture (e.g., fields of tumuli, lustrous stone rings, axes) was intricate. By 1800 BCE, Saharan pastoral culture expanded throughout the Saharan and Sahelian regions. The initial stages of sophisticated social structure among Saharan herders served as the segue for the development of sophisticated hierarchies found in African settlements, such as Dhar Tichitt. After migrating from the Central Sahara, proto-Mande peoples established their civilization in the Tichitt region of the Western Sahara[88] The Tichitt Tradition of eastern Mauritania dates from 2200 BCE[89][90] to 200 BCE. Tichitt culture, at Dhar Néma, Dhar Tagant, Dhar Tichitt, and Dhar Walata, included a four-tiered hierarchal social structure, farming of cereals, metallurgy, numerous funerary tombs, and a rock art tradition At Dhar Tichitt and Dhar Walata, pearl millet may have also been independently tamed amid the Neolithic. Dhar Tichitt, which includes Dakhlet el Atrouss, may have served as the primary regional center for the multi-tiered hierarchical social structure of the Tichitt Tradition, and the Malian Lakes Region, which includes Tondidarou, may have served as a second regional center of the Tichitt Tradition. The urban Tichitt Tradition may have been the earliest large-scale, complexly organized society in West Africa, and an early civilization of the Sahara, which may have served as the segue for state formation in West Africa.
As areas where the Tichitt cultural tradition were present, Dhar Tichitt and Dhar Walata were occupied more frequently than Dhar Néma. Farming of crops (e.g., millet) may have been a feature of the Tichitt cultural tradition as early as 3rd millennium BCE in Dhar Tichitt.
As part of a broader trend of iron metallurgy developed in the West African Sahel amid 1st millennium BCE, iron items (350 BCE – 100 CE) were found at Dhar Tagant, iron metalworking and/or items (800 BCE – 400 BCE) were found at Dia Shoma and Walaldé, and the iron remnants (760 BCE – 400 BCE) found at Bou Khzama and Djiganyai. The iron materials that were found are evidence of iron metalworking at Dhar Tagant. In the late period of the Tichitt Tradition at Dhar Néma, tamed pearl millet was used to temper the tuyeres of a oval-shaped low shaft furnace; this furnace was one out of 16 iron furnaces located on elevated ground. Iron metallurgy may have developed before the second half of 1st millennium BCE, as indicated by pottery dated between 800 BCE and 200 BCE. At Dhar Walata and Dhar Tichitt, copper was also used.
After its decline in Mauritania, the Tichitt Tradition spread to the Middle Niger region (e.g., Méma, Macina, Dia Shoma, Jenne Jeno) of Mali where it developed into and persisted as Faïta Facies ceramics between 1300 BCE and 400 BCE among rammed earth architecture and iron metallurgy (which had developed after 900 BCE). Thereafter, the Ghana Empire developed in the 1st millennium CE.
Phoenicians
The people of Phoenicia, who flourished from 1200 to 800 BCE, created a chain of settlements along the coast of North Africa and traded extensively with its inhabitants. This put them in contact with the people of ancient Libya, who were the ancestors of people who speak Berber languages in North Africa and the Sahara today.
The Libyco-Berber alphabet of the ancient Libyans of north Africa seems to have been based on Phoenician, and its descendant Tifinagh is still used today by the (Berber) Tuareg of the central Sahara.
The Periplus of the Phoenician navigator Hanno, who lived sometime in the 5th century BC, claims that he founded settlements along the Atlantic coast of Africa, possibly including the Western Sahara. The identification of the places discussed is controversial, and archeological confirmation is lacking.
Greeks
By 500 BCE, Greeks arrived in the desert. Greek traders spread along the eastern coast of the desert, establishing trading colonies along the Red Sea. The Carthaginians explored the Atlantic coast of the desert, but the turbulence of the waters and the lack of markets caused a lack of presence further south than modern Morocco. Centralized states thus surrounded the desert on the north and east; it remained outside the control of these states. Raids from the nomadic Berber people of the desert were of constant concern to those living on the edge of the desert.
Garamantes
An urban civilization, the Garamantes, arose around 500 BCE in the heart of the Sahara, in a valley that is now called the Wadi al-Ajal in Fezzan, Libya. The Garamantes built a prosperous empire in the heart of the desert. The Garamantes achieved this development by digging tunnels far into the mountains flanking the valley to tap fossil water and bring it to their fields. The Garamantes grew populous and strong, conquering their neighbors, and capturing and enslaving many individuals who were forced to work by extending the tunnels. The ancient Greeks and the Romans knew of the Garamantes and regarded them as uncivilized nomads. However, they traded with them, and a Roman bath has been found in the Garamantes' capital of Garama. Archaeologists have found eight major towns and many other important settlements in the Garamantes' territory. The Garamantes' civilization eventually collapsed after they had depleted available water in the aquifers and could no longer sustain the effort to extend the tunnels further into the mountains.
Between the first century BCE and the fourth century CE, several Roman expeditions into the Sahara were conducted by groups of military and commercial units of Romans.
Islamic and Arabic expansion
Main articles: Trans-Saharan trade and Islamization of Sudan
The Byzantine Empire ruled the northern shores of the Sahara from the 5th to the 7th centuries. After the Muslim conquest of Arabia, specifically the Arabian peninsula, the Muslim conquest of North Africa began in the mid-7th to early 8th centuries and Islamic influence expanded rapidly on the Sahara. By the end of 641 all of Egypt was in Muslim hands. Trade across the desert intensified, and a significant slave trade crossed the desert. It has been estimated that from the 10th to 19th centuries some 6,000 to 7,000 slaves were transported north each year.
The Beni Ḥassān and other nomadic Arab tribes dominated the Sanhaja Berber tribes of the western Sahara after the Char Bouba war of the 17th century. As a result, Arabian culture and language came to dominate, and the Berber tribes underwent some Arabization.
Ottoman Turkish era
In the 16th century the northern fringe of the Sahara, such as coastal regencies in present-day Algeria and Tunisia, as well as some parts of present-day Libya, together with the semi-autonomous kingdom of Egypt, were occupied by the Ottoman Empire. From 1517 Egypt was a valued part of the Ottoman Empire, ownership of which provided the Ottomans with control over the Nile Valley, the east Mediterranean and North Africa. The benefit of the Ottoman Empire was the freedom of movement for citizens and goods. Traders exploited the Ottoman land routes to handle the spices, gold and silk from the East, manufactured goods from Europe, and the slave and gold traffic from Africa. Arabic continued as the local language and Islamic culture was much reinforced. The Sahel and southern Sahara regions were home to several independent states or to roaming Tuareg clans.
European colonialism
European colonialism in the Sahara began in the 19th century. France conquered the regency of Algiers from the Ottomans in 1830, and French rule spread south from French Algeria and eastwards from Senegal into the upper Niger to include present-day Algeria, Chad, Mali then French Sudan including Timbuktu (1893), Mauritania, Morocco (1912), Niger, and Tunisia (1881). By the beginning of the 20th century, the trans-Saharan trade had clearly declined because goods were moved through more modern and efficient means, such as airplanes, rather than across the desert.
The French took advantage of long-standing animosity between the Chaamba Arabs and the Tuareg. The newly raised Méhariste camel corps were originally recruited mainly from the Chaamba nomadic tribe. In 1902, the French penetrated the Hoggar mountains and defeated Ahaggar Tuareg in the battle of Tit.
The French Colonial Empire was the dominant presence in the Sahara. It established regular air links from Toulouse (HQ of famed Aéropostale), to Oran and over the Hoggar to Timbuktu and West to Bamako and Dakar, as well as trans-Sahara bus services run by La Compagnie Transsaharienne (est. 1927). A remarkable film shot by famous aviator Captain René Wauthier in 1933 documents the first crossing by a large truck convoy from Algiers to Tchad, across the Sahara.
Egypt, under Muhammad Ali and his successors, conquered Nubia in 1820–22, founded Khartoum in 1823, and conquered Darfur in 1874. Egypt, including Sudan, became a British protectorate in 1882. Egypt and Britain lost control of the Sudan from 1882 to 1898 as a result of the Mahdist War. After its capture by British troops in 1898, the Sudan became an Anglo-Egyptian condominium.
Spain captured present-day Western Sahara after 1874, although Rio del Oro remained largely under Sahrawi influence. In 1912, Italy captured parts of what was to be named Libya from the Ottomans. To promote the Roman Catholic religion in the desert, Pope Pius IX appointed a delegate Apostolic of the Sahara and the Sudan in 1868; later in the 19th century his jurisdiction was reorganized into the Vicariate Apostolic of Sahara.
Egypt became independent of Britain in 1936, although the Anglo-Egyptian treaty of 1936 allowed Britain to keep troops in Egypt and to maintain the British-Egyptian condominium in the Sudan. British military forces were withdrawn in 1954.
Most of the Saharan states achieved independence after World War II: Libya in 1951; Morocco, Sudan, and Tunisia in 1956; Chad, Mali, Mauritania, and Niger in 1960; and Algeria in 1962. Spain withdrew from Western Sahara in 1975, and it was partitioned between Mauritania and Morocco. Mauritania withdrew in 1979; Morocco continues to hold the territory (see Western Sahara conflict).
Tuareg people in Mali rebelled several times during the 20th century before finally forcing the Malian armed forces to withdraw below the line demarcating Azawad from southern Mali during the 2012 rebellion. Islamist rebels in the Sahara calling themselves al-Qaeda in the Islamic Maghreb have stepped up their violence in recent years.
In the post–World War II era, several mines and communities have developed to use the desert's natural resources. These include large deposits of oil and natural gas in Algeria and Libya, and large deposits of phosphates in Morocco and Western Sahara. Libya's Great Man-Made River is the world's largest irrigation project. The project uses a pipeline system that pumps fossil water from the Nubian Sandstone Aquifer System to cities in the populous Libyan northern Mediterranean coast including Tripoli and Benghazi.
A number of Trans-African highways have been proposed across the Sahara, including the Cairo–Dakar Highway along the Atlantic coast, the Trans-Sahara Highway from Algiers on the Mediterranean to Kano in Nigeria, the Tripoli – Cape Town Highway from Tripoli in Libya to N'Djamena in Chad, and the Cairo – Cape Town Highway which follows the Nile. Each of these highways is partially complete, with significant gaps and unpaved sections.
People, culture, and languages
A 19th-century engraving of an Arab slave-trading caravan transporting black African slaves across the Sahara
The people of the Sahara are of various origins. Among them the Amazigh including the Tuareg, various Arabized Amaziɣ groups such as the Hassaniya-speaking Sahrawis, whose populations include the Znaga, a tribe whose name is a remnant of the pre-historic Zenaga language. Other major groups of people include the: Toubou, Nubians, Zaghawa, Kanuri, Hausa, Songhai, Beja, and Fula/Fulani (French: Peul; Fula: Fulɓe). The archaeological evidence from the Holocene period has shown that Nilo-Saharan speaking groups had populated the central and southern Sahara before the influx of Berber and Arabic speakers, around 1500 years ago, who now largely populate the Sahara in the modern era.
Arabic dialects are the most widely spoken languages in the Sahara. Arabic, Berber and its variants now regrouped under the term Amazigh (which includes the Guanche language spoken by the original Berber inhabitants of the Canary Islands) and Beja languages are part of the Afro-Asiatic or Hamito-Semitic family.[citation needed] Unlike neighboring West Africa and the central governments of the states that comprise the Sahara, the French language bears little relevance to inter-personal discourse and commerce within the region, its people retaining staunch ethnic and political affiliations with Tuareg and Berber leaders and culture. The legacy of the French colonial era administration is primarily manifested in the territorial reorganization enacted by the Third and Fourth republics, which engendered artificial political divisions within a hitherto isolated and porous region.[113] Diplomacy with local clients was conducted primarily in Arabic, which was the traditional language of bureaucratic affairs. Mediation of disputes and inter-agency communication was served by interpreters contracted by the French government, who, according to Keenan, "documented a space of intercultural mediation," contributing much to preserving the indigenous cultural identities in the region.
C-FDRK Airbus A320-211 [0084] (Air Canada) Ottawa-Macdonald Cartier Int'l~C 18/06/2005. WFU stored Marana AZ~N 16-09-2019
The Skylon Tower, in Niagara Falls, Ontario, is an observation tower that overlooks both the American Falls, New York, and the larger Horseshoe Falls, Ontario, from the Canadian side of the Niagara River.
History
Construction of the Skylon began in May 1964. The tower was opened on October 6, 1965, by New York Governor Nelson Rockefeller and Ontario Premier John Robarts. Costing $7 million at the time of its construction, the Skylon Tower was owned by a private partnership called Niagara International Centre, which was financed by Hershey Foods shareholdings of Charles Richard Reese, former co-owner of the H. B. Reese Candy Company of Hershey, Pennsylvania. Canadian Pacific Hotels (CPH) was hired to operate the tower restaurants and lounges.
On October 1, 1975, CPH purchased the tower from Mr. Reese and his partners for $11 million. The tower's summit features a verdigris-green copper roof similar to CPH's other properties, including the Château Frontenac in Quebec City and the Banff Springs Hotel in Banff, Alberta. CPH owned and operated the tower until 1986, when it was sold for $18 million to two local Niagara hotel owners, John Gruyich of Michael's Inn and George Yerich of the Holiday Inn By The Falls Motel. In 1988, George Yerich bought out John Gruyich's ownership share of the Skylon for $13 million, however Milicent Gruyich continues to own the land the tower is built on. Mr. Yerich's Skylon land lease will expire in 2060, at which time the Skylon Tower will revert to total ownership by the heirs of Milicent Gruyich.
While much redevelopment has taken place in the surrounding city, the Skylon Tower complex still retains much of its look and feel from the 1970s and 1980s. However the property has recently been expanded to include a 3D/4D Theatre, a Starbucks franchise, other quick-service franchises and a bridge connecting the complex with the newly completed Fallsview Casino. In August and September 2008 the roof of Skylon was restored to its original bright copper colour.
In recent years, the lights that shine up the tower at night have gone from being the typical white lights to a selection of colours that interchange. This is done in a similar fashion to the lights that shine on the falls themselves.
Features
Standing at 160 metres (520 ft) from street level and 236 metres (775 ft) from the bottom of the falls, the tower required approval from both Canadian and United States air transport authorities, due to its proximity to the international boundary. It was the second tower to be built using the slipform method, in which concrete is continuously poured into a form moving slowly up the tower. It was built by Pigott Construction of Hamilton, Ontario. The same methods were also used to build the Inco Superstack in Sudbury, and the CN Tower in Toronto.
The tower features three outside-mounted "Yellow Bug" elevators. At the time of their construction, they were the first such elevators in Canada. They were designed, engineered and maintained by a division of the Otis Elevator Company from Hamilton, Ontario and can carry passengers to the top of the tower in 52 seconds. Unlike conventional elevators that are guided by side rails, the Skylon elevators operate with a guide rail on the backside only. Special equipment is employed to prevent the cables from becoming tangled in the wind or impeded by snow and ice in the winter. A curtain wall on the outside of the tower behind each elevator protects the counterweight and travelling cables from the elements.
The tower has two restaurants at its top, the Revolving Dining Room and the upper Summit Suite Buffet. The Revolving Dining Room seats 276 people and revolves once every hour by resting on a circular rail that is propelled by a 3 horsepower (2.2 kW) motor. An observation deck sits at the tower's summit. The base of the tower features a number of gift shops, fast food restaurants and a large amusement arcade. A floor for conventions is also available, but is seldom utilized.
Niagara Falls is a city in Ontario, Canada. It is on the western bank of the Niagara River in the Golden Horseshoe region of Southern Ontario, with a population of 94,415 at the 2021 census. It is part of the St. Catharines - Niagara Census Metropolitan Area (CMA). Incorporated on 12 June 1903, the city is across the river from Niagara Falls, New York. The Niagara River flows over Niagara Falls at this location, creating a natural spectacle which attracts millions of tourists each year.
The tourist area near the falls includes observation towers, high-rise hotels, souvenir shops, museums, indoor water parks, casinos and theatres, mostly with colourful neon billboards and advertisements. Other parts of the city include golf courses, parks, historic sites from the War of 1812, and residential neighbourhoods.
History
Prior to European arrival, present day Niagara Falls was populated by Iroquoian-speaking Neutral people but, after attacks from the Haudenosaunee and Seneca, the Neutral people population was severely reduced. The Haudenosaunee people remained in the area until Europeans made first contact in the late 17th century. The Niagara Falls area had some European settlement in the 17th century. Louis Hennepin, a French priest and missionary, is considered to be the first European to visit the area in the 1670s. French colonists settled mostly in Lower Canada, beginning near the Atlantic, and in Quebec and Montreal.
After surveys were completed in 1782 the area was referred to as Township Number 2 as well as Mount Dorchester after Guy Carleton, 1st Baron Dorchester (and today is only honoured by Dorchester Road and the community of Dorchester Village). The earliest settlers of Township Number 2 were Philip George Bender (namesake of Bender Street and Bender Hill near Casino Niagara originally from Germany and later New Jersey and Philadelphia) and Thomas McMicken (a Scottish-born British Army veteran). Increased settlement in this area took place during and after the American Revolutionary War, when the British Crown made land grants to Loyalists to help them resettle in Upper Canada and provide some compensation for their losses after the United States became independent. Loyalist Robert Land received 200 acres (81 ha) and was one of the first people of European descent to settle in the Niagara Region. He moved to nearby Hamilton three years later due to the relentless noise of the falls.
In 1791, John Graves Simcoe renamed the town was Stamford after Stamford, Lincolnshire in England[7] but today Stamford is only used for an area northwest of downtown Niagara Falls as well as Stamford Street. During the war of 1812, the battle of Lundy's Lane took place in July 1814. In 1856, the Town of Clifton was incorporated by Ogden Creighton after Clifton, Bristol. The name of the town was changed to Niagara Falls in 1881. In 1882, the community of Drummondville (near the present-day corner of Lundy's Lane and Main Street) was incorporated as the village of Niagara Falls (South). The village was referred to as Niagara Falls South to differentiate it from the town. In 1904, the town and village amalgamated to form the City of Niagara Falls. In 1963, the city amalgamated with the surrounding Stamford Township. In 1970, the Niagara regional government was formed. This resulted in the village of Chippawa, Willoughby Township, and part of Crowland Township being annexed into Niagara Falls.
An internment camp for Germans was set up at The Armoury (now Niagara Military Museum) in Niagara Falls from December 1914 to August 1918.
Black history
Niagara Falls has had a Black population since at least 1783. Up to 12 African-Americans were a part of the Butler's Rangers, including Richard Pierpoint. When they were disbanded in 1783, they tried to establish themselves through farming nearby, making them among the first Black settlers in the region. It is estimated that nearly 10 percent of the Loyalists to settle in the area were Black Loyalists.
Niagara Falls' Black population increased in the following decades, as a destination on the Underground Railroad. In 1856, a British Methodist Episcopal (BME) Church was established for African-Canadian worshipers. The BME Church, Nathaniel Dett Memorial Chapel is now a National Historic Site, remaining in operation into the 21st century. Composer, organist, pianist and music professor Nathaniel Dett was born in Niagara Falls in 1882.
In 1886, Burr Plato became one of the first African Canadians to be elected to political office, holding the position of City Councillor of Niagara Falls until 1901.
Geography
Niagara Falls is approximately 130 km (81 mi) by road from Ontario's capital of Toronto, which is across Lake Ontario to the north. The area of the Niagara Region is approximately 1,800 km2 (690 sq mi).
Topography
The city is built along the Niagara Falls waterfalls and the Niagara Gorge on the Niagara River, which flows from Lake Erie to Lake Ontario.
Climate
The city of Niagara Falls has a humid continental climate (Köppen Dfa) which is moderated to an extent in all seasons by proximity to water bodies. Winters are cold, with a January high of −0.4 °C (31.3 °F) and a low of −7.8 °C (18.0 °F). However, temperatures above 0 °C (32.0 °F) are common during winter. The average annual snowfall is 154 centimetres (61 in), in which it can receive lake effect snow from both lakes Erie and Ontario. Summers are warm to hot and humid, with a July high of 27.4 °C (81.3 °F) and a low of 17 °C (62.6 °F). The average annual precipitation is 970.2 millimetres (38 in), which is relatively evenly distributed throughout the year.
In the 2021 Census of Population conducted by Statistics Canada, Niagara Falls had a population of 94,415 living in 37,793 of its 39,778 total private dwellings, a change of 7.2% from its 2016 population of 88,071. With a land area of 210.25 km2 (81.18 sq mi), it had a population density of 449.1/km2 (1,163.1/sq mi) in 2021.
At the census metropolitan area (CMA) level in the 2021 census, the St. Catharines - Niagara CMA had a population of 433,604 living in 179,224 of its 190,878 total private dwellings, a change of 6.8% from its 2016 population of 406,074. With a land area of 1,397.09 km2 (539.42 sq mi), it had a population density of 310.4/km2 (803.8/sq mi) in 2021.
As of the 2021 Census, 20.9% of the city's population were visible minorities, 3.5% had Indigenous ancestry, and the remaining 75.6% were White. The largest visible minority groups were South Asian (6.3%), Black (3.1%), Filipino (3.0%), Chinese (2.4%), Latin American (1.6%) and Arab (1.1%).
60.1% of Niagara Falls city residents self-identified with Christian denominations in 2021, down from 74.1% in 2011. 33.2% of residents were Catholic, 13.9% were Protestant, 7.1% were Christians of unspecified denomination, and 2.4% were Christian Orthodox. All other Christian denominations/Christian related traditions made up 3.5%. 30.9% of residents were irreligious or secular, up from 22.5% in 2011. Overall, followers of non-Christian religions/spiritual traditions were 9.0% of the population. The largest of these were Islam (4.1%), Hinduism (2.0%), Sikhism (1.4%) and Buddhism (0.8%)
Tourism started in the early 19th century and has been a vital part of the local economy since that time. The falls became known as a natural wonder, in part to their being featured in paintings by prominent American artists of the 19th century such as Albert Bierstadt. Such works were reproduced as lithographs, becoming widely distributed. Niagara Falls marketed itself as a honeymoon destination, describing itself as the "honeymoon capital of the world". Its counterpart in New York also used the moniker. The phrase was most commonly used in brochures in the early twentieth century and declined in usage around the 1960s.
With a plentiful and inexpensive source of hydroelectric power from the waterfalls, many electro-chemical and electro-metallurgical industries located there in the early to mid-20th century. Industry began moving out of the city in the 1970s and 80s because of economic recession and increasing global competition in the manufacturing sector. Tourism increasingly became the city's most important revenue source.
In 2004, several tourist establishments in Niagara Falls began adding a three percent marketing fee to bills. The collected money is untraceable, and there are no controls over how each establishment spends it. The Ontario government—concerned tourists could be misled into believing the fees were endorsed by the government—warned hotels and restaurants in 2008 not to claim the fee if it was not being remitted to a legitimate non-profit agency that promotes tourism. The practise continues, and takes in an estimated $15 million per-year from tourists unaware the fee is voluntary and can be removed from their bill.
Recent development has been mostly centred on the Clifton Hill and Fallsview areas. The Niagara Falls downtown (Queen Street) is undergoing a major revitalization; the city is encouraging redevelopment of this area as an arts and culture district. The downtown was a major centre for local commerce and night life up until the 1970s, when the Niagara Square Shopping Centre began to draw away crowds and retailers. Since 2006, Historic Niagara has brought art galleries, boutiques, cafés and bistros to the street. Attractions include renovation of the Seneca Theatre.
Comparison to Niagara Falls, New York
In the 20th century, there was a favourable exchange rate when comparing Canadian and U.S. currencies.
Niagara Falls, New York, struggles to compete against Niagara Falls, Ontario; the Canadian side has a greater average annual income, a higher average home price, and lower levels of vacant buildings and blight, as well as a more vibrant economy and better tourism infrastructure. The population of Niagara Falls, New York fell by half from the 1960s to 2012. In contrast, the population of Niagara Falls, Ontario more than tripled.
The Ontario government introduced legal gambling to the local economy in the mid-1990s. Casino Niagara precipitated an economic boom in the late 1990s as numerous luxury hotels and tourist attractions were built, and a second casino, Niagara Fallsview, opened in 2004. Both attracted American tourists due in part to the comparatively less expensive Canadian dollar, and despite the opening of the Seneca Niagara Casino on the American side. When the Canadian and US currencies moved closer to parity in the 2000s, Niagara Falls, Ontario continued to be a popular destination for Americans, while Niagara Falls, New York, experienced a prolonged economic downturn. Ontario's legal drinking age is 19, which attracts potential alcohol consumers from across the border, as the American drinking age is 21.
Attractions
Table Rock Welcome Centre
Journey Behind the Falls
Skylon Tower
Niagara SkyWheel
Winter Festival of Lights
Niagara Parks Butterfly Conservatory
Niagara Heritage Trail
Dufferin Islands
Niagara Parks School of Horticulture
The Rainbow Carillon, which sounds from the Rainbow Tower
Clifton Hill, Niagara Falls — Tourist promenade featuring a Ripley's Believe It Or Not Museum, arcades, five haunted houses, four wax museums including a Louis Tussauds Wax Works, and themed restaurants including the Hard Rock Cafe and Rainforest Cafe.
Marineland — Aquatic theme park
Casinos — Casino Niagara and Niagara Fallsview Casino Resort
IMAX Theatre and Daredevil museum
Fallsview Tourist Area
Fallsview Indoor Waterpark
Tower Hotel (Niagara Falls)
Notable people
Bruno Agostinelli, professional tennis player[48]
Ray Barkwill, Canadian national rugby player[49]
Harold Bradley, classical pianist
Cathy Marie Buchanan, author
James Cameron, film director
Bill Cupolo, NHL player
Kevin Dallman, NHL player
Marty Dallman, NHL player
Frank Dancevic, professional tennis player
Sandro DeAngelis, CFL kicker
Robert Nathaniel Dett, composer born in Drummondville
Joe Fletcher, referee at FIFA World Cup
Tre Ford, CFL quarterback
Tyrell Ford, former CFL and NFL cornerback
Barbara Frum, CBC broadcaster
William Giauque, recipient of 1949 Nobel Prize in Chemistry
Mike Glumac, professional hockey player
Brian Greenspan, lawyer
Eddie Greenspan, lawyer
Bobby Gunn, boxer
Obs Heximer, NHL player
Tim Hicks, country singer
Honeymoon Suite, rock band
Harold Howard, retired mixed martial artist and UFC fighter
Jon Klassen, illustrator and children's book author
Johnathan Kovacevic, NHL player
Judy LaMarsh, second female federal cabinet minister in Canadian history
Steve Ludzik, NHL player
Denise Matthews, evangelist, singer
Bob Manno, NHL player
John McCall MacBain, philanthropist, billionaire businessman, founder and former CEO of Trader Classified Media
Nenad Medic, poker player
Stephan Moccio, musician, arranger, composer
Tom Moore, trade unionist
Rick Morocco, ice hockey executive and professional player[50]
Johnny Mowers, NHL goalie
Rob Nicholson, former Minister of Justice and Attorney General for Canada
Terry O'Reilly, NHL player and head coach
Roula Partheniou, contemporary artist
Frank Pietrangelo, NHL goalie
Burr Plato, politician
deadmau5, musician and DJ
Isabelle Rezazadeh, DJ and record producer
Phil Roberto, NHL player
Derek Sanderson, NHL player
Jarrod Skalde, NHL player
Russell Teibert, soccer player
Jay Triano, former NBA head coach
Gillian Robertson, UFC Fighter
Tvangeste, symphonic black metal band formerly based on Kaliningrad, Russia
Wave, pop band
Sherman Zavitz, historian
Murda Beatz, Producer and DJ
Steve Terreberry, musician, comedian, and YouTuber
Mary Ellen Turpel-Lafond, lawyer and professor; former judge
Greg Kovacs, bodybuilder
Mia madre Maria Lavinia Bovelli (1938 - 1992) circa nel 1960, aveva 22 anni ed era una laureanda in Fisica all'Universitò di Roma e ricercatrice al Sincrotrone di Frascati. Quando avro tempo mi metterò a cercare dove è stata scattata questa foto, probabilmente vicino a via Tarvisio dove abitava con la famiglia a quel tempo. Se nel frattempo qualcuno riconoscesse il posto sarei felice di averne notizia. Devo ringraziare lo zio Virgilio per aver trovato questa bellissima foto in bianco e nero. Rullino n.18. Scansionata e ritoccata con photoshop.
------------------------------------------------------------------------------------------
My mother Maria Lavinia Bovelli (1938 - 1992) in 1960 circa, she was 22 years old and was a graduand in Physics at University of Rome and researcher at Synchrotron of Frascati.
I have to thank uncle Virgilio for having found this beautiful black and white picture. Scanned and retouched with photoshop.
O Tempo divoratore, e tu, invidiosa Vecchiaia, voi tutto distruggete e a poco a poco consumate ogni cosa facendola morire, rosa dai denti dell’età, di morte lenta. Publio Ovidio Nasone (43 a.C. – 18 d.C.), poeta e autore latino.
Or time consuming, and you, envious old age, you destroy everything and gradually consumed everything making her squirm, rose from the teeth of age, a slow death. Ovid (43 BC - 18 AD), Latin poet and author.
Niagara Falls is a city in Ontario, Canada. It is on the western bank of the Niagara River in the Golden Horseshoe region of Southern Ontario, with a population of 94,415 at the 2021 census. It is part of the St. Catharines - Niagara Census Metropolitan Area (CMA). Incorporated on 12 June 1903, the city is across the river from Niagara Falls, New York. The Niagara River flows over Niagara Falls at this location, creating a natural spectacle which attracts millions of tourists each year.
The tourist area near the falls includes observation towers, high-rise hotels, souvenir shops, museums, indoor water parks, casinos and theatres, mostly with colourful neon billboards and advertisements. Other parts of the city include golf courses, parks, historic sites from the War of 1812, and residential neighbourhoods.
History
Prior to European arrival, present day Niagara Falls was populated by Iroquoian-speaking Neutral people but, after attacks from the Haudenosaunee and Seneca, the Neutral people population was severely reduced. The Haudenosaunee people remained in the area until Europeans made first contact in the late 17th century. The Niagara Falls area had some European settlement in the 17th century. Louis Hennepin, a French priest and missionary, is considered to be the first European to visit the area in the 1670s. French colonists settled mostly in Lower Canada, beginning near the Atlantic, and in Quebec and Montreal.
After surveys were completed in 1782 the area was referred to as Township Number 2 as well as Mount Dorchester after Guy Carleton, 1st Baron Dorchester (and today is only honoured by Dorchester Road and the community of Dorchester Village). The earliest settlers of Township Number 2 were Philip George Bender (namesake of Bender Street and Bender Hill near Casino Niagara originally from Germany and later New Jersey and Philadelphia) and Thomas McMicken (a Scottish-born British Army veteran). Increased settlement in this area took place during and after the American Revolutionary War, when the British Crown made land grants to Loyalists to help them resettle in Upper Canada and provide some compensation for their losses after the United States became independent. Loyalist Robert Land received 200 acres (81 ha) and was one of the first people of European descent to settle in the Niagara Region. He moved to nearby Hamilton three years later due to the relentless noise of the falls.
In 1791, John Graves Simcoe renamed the town was Stamford after Stamford, Lincolnshire in England[7] but today Stamford is only used for an area northwest of downtown Niagara Falls as well as Stamford Street. During the war of 1812, the battle of Lundy's Lane took place in July 1814. In 1856, the Town of Clifton was incorporated by Ogden Creighton after Clifton, Bristol. The name of the town was changed to Niagara Falls in 1881. In 1882, the community of Drummondville (near the present-day corner of Lundy's Lane and Main Street) was incorporated as the village of Niagara Falls (South). The village was referred to as Niagara Falls South to differentiate it from the town. In 1904, the town and village amalgamated to form the City of Niagara Falls. In 1963, the city amalgamated with the surrounding Stamford Township. In 1970, the Niagara regional government was formed. This resulted in the village of Chippawa, Willoughby Township, and part of Crowland Township being annexed into Niagara Falls.
An internment camp for Germans was set up at The Armoury (now Niagara Military Museum) in Niagara Falls from December 1914 to August 1918.
Black history
Niagara Falls has had a Black population since at least 1783. Up to 12 African-Americans were a part of the Butler's Rangers, including Richard Pierpoint. When they were disbanded in 1783, they tried to establish themselves through farming nearby, making them among the first Black settlers in the region. It is estimated that nearly 10 percent of the Loyalists to settle in the area were Black Loyalists.
Niagara Falls' Black population increased in the following decades, as a destination on the Underground Railroad. In 1856, a British Methodist Episcopal (BME) Church was established for African-Canadian worshipers. The BME Church, Nathaniel Dett Memorial Chapel is now a National Historic Site, remaining in operation into the 21st century. Composer, organist, pianist and music professor Nathaniel Dett was born in Niagara Falls in 1882.
In 1886, Burr Plato became one of the first African Canadians to be elected to political office, holding the position of City Councillor of Niagara Falls until 1901.
Geography
Niagara Falls is approximately 130 km (81 mi) by road from Ontario's capital of Toronto, which is across Lake Ontario to the north. The area of the Niagara Region is approximately 1,800 km2 (690 sq mi).
Topography
The city is built along the Niagara Falls waterfalls and the Niagara Gorge on the Niagara River, which flows from Lake Erie to Lake Ontario.
Climate
The city of Niagara Falls has a humid continental climate (Köppen Dfa) which is moderated to an extent in all seasons by proximity to water bodies. Winters are cold, with a January high of −0.4 °C (31.3 °F) and a low of −7.8 °C (18.0 °F). However, temperatures above 0 °C (32.0 °F) are common during winter. The average annual snowfall is 154 centimetres (61 in), in which it can receive lake effect snow from both lakes Erie and Ontario. Summers are warm to hot and humid, with a July high of 27.4 °C (81.3 °F) and a low of 17 °C (62.6 °F). The average annual precipitation is 970.2 millimetres (38 in), which is relatively evenly distributed throughout the year.
In the 2021 Census of Population conducted by Statistics Canada, Niagara Falls had a population of 94,415 living in 37,793 of its 39,778 total private dwellings, a change of 7.2% from its 2016 population of 88,071. With a land area of 210.25 km2 (81.18 sq mi), it had a population density of 449.1/km2 (1,163.1/sq mi) in 2021.
At the census metropolitan area (CMA) level in the 2021 census, the St. Catharines - Niagara CMA had a population of 433,604 living in 179,224 of its 190,878 total private dwellings, a change of 6.8% from its 2016 population of 406,074. With a land area of 1,397.09 km2 (539.42 sq mi), it had a population density of 310.4/km2 (803.8/sq mi) in 2021.
As of the 2021 Census, 20.9% of the city's population were visible minorities, 3.5% had Indigenous ancestry, and the remaining 75.6% were White. The largest visible minority groups were South Asian (6.3%), Black (3.1%), Filipino (3.0%), Chinese (2.4%), Latin American (1.6%) and Arab (1.1%).
60.1% of Niagara Falls city residents self-identified with Christian denominations in 2021, down from 74.1% in 2011. 33.2% of residents were Catholic, 13.9% were Protestant, 7.1% were Christians of unspecified denomination, and 2.4% were Christian Orthodox. All other Christian denominations/Christian related traditions made up 3.5%. 30.9% of residents were irreligious or secular, up from 22.5% in 2011. Overall, followers of non-Christian religions/spiritual traditions were 9.0% of the population. The largest of these were Islam (4.1%), Hinduism (2.0%), Sikhism (1.4%) and Buddhism (0.8%)
Tourism started in the early 19th century and has been a vital part of the local economy since that time. The falls became known as a natural wonder, in part to their being featured in paintings by prominent American artists of the 19th century such as Albert Bierstadt. Such works were reproduced as lithographs, becoming widely distributed. Niagara Falls marketed itself as a honeymoon destination, describing itself as the "honeymoon capital of the world". Its counterpart in New York also used the moniker. The phrase was most commonly used in brochures in the early twentieth century and declined in usage around the 1960s.
With a plentiful and inexpensive source of hydroelectric power from the waterfalls, many electro-chemical and electro-metallurgical industries located there in the early to mid-20th century. Industry began moving out of the city in the 1970s and 80s because of economic recession and increasing global competition in the manufacturing sector. Tourism increasingly became the city's most important revenue source.
In 2004, several tourist establishments in Niagara Falls began adding a three percent marketing fee to bills. The collected money is untraceable, and there are no controls over how each establishment spends it. The Ontario government—concerned tourists could be misled into believing the fees were endorsed by the government—warned hotels and restaurants in 2008 not to claim the fee if it was not being remitted to a legitimate non-profit agency that promotes tourism. The practise continues, and takes in an estimated $15 million per-year from tourists unaware the fee is voluntary and can be removed from their bill.
Recent development has been mostly centred on the Clifton Hill and Fallsview areas. The Niagara Falls downtown (Queen Street) is undergoing a major revitalization; the city is encouraging redevelopment of this area as an arts and culture district. The downtown was a major centre for local commerce and night life up until the 1970s, when the Niagara Square Shopping Centre began to draw away crowds and retailers. Since 2006, Historic Niagara has brought art galleries, boutiques, cafés and bistros to the street. Attractions include renovation of the Seneca Theatre.
Comparison to Niagara Falls, New York
In the 20th century, there was a favourable exchange rate when comparing Canadian and U.S. currencies.
Niagara Falls, New York, struggles to compete against Niagara Falls, Ontario; the Canadian side has a greater average annual income, a higher average home price, and lower levels of vacant buildings and blight, as well as a more vibrant economy and better tourism infrastructure. The population of Niagara Falls, New York fell by half from the 1960s to 2012. In contrast, the population of Niagara Falls, Ontario more than tripled.
The Ontario government introduced legal gambling to the local economy in the mid-1990s. Casino Niagara precipitated an economic boom in the late 1990s as numerous luxury hotels and tourist attractions were built, and a second casino, Niagara Fallsview, opened in 2004. Both attracted American tourists due in part to the comparatively less expensive Canadian dollar, and despite the opening of the Seneca Niagara Casino on the American side. When the Canadian and US currencies moved closer to parity in the 2000s, Niagara Falls, Ontario continued to be a popular destination for Americans, while Niagara Falls, New York, experienced a prolonged economic downturn. Ontario's legal drinking age is 19, which attracts potential alcohol consumers from across the border, as the American drinking age is 21.
Attractions
Table Rock Welcome Centre
Journey Behind the Falls
Skylon Tower
Niagara SkyWheel
Winter Festival of Lights
Niagara Parks Butterfly Conservatory
Niagara Heritage Trail
Dufferin Islands
Niagara Parks School of Horticulture
The Rainbow Carillon, which sounds from the Rainbow Tower
Clifton Hill, Niagara Falls — Tourist promenade featuring a Ripley's Believe It Or Not Museum, arcades, five haunted houses, four wax museums including a Louis Tussauds Wax Works, and themed restaurants including the Hard Rock Cafe and Rainforest Cafe.
Marineland — Aquatic theme park
Casinos — Casino Niagara and Niagara Fallsview Casino Resort
IMAX Theatre and Daredevil museum
Fallsview Tourist Area
Fallsview Indoor Waterpark
Tower Hotel (Niagara Falls)
Notable people
Bruno Agostinelli, professional tennis player[48]
Ray Barkwill, Canadian national rugby player[49]
Harold Bradley, classical pianist
Cathy Marie Buchanan, author
James Cameron, film director
Bill Cupolo, NHL player
Kevin Dallman, NHL player
Marty Dallman, NHL player
Frank Dancevic, professional tennis player
Sandro DeAngelis, CFL kicker
Robert Nathaniel Dett, composer born in Drummondville
Joe Fletcher, referee at FIFA World Cup
Tre Ford, CFL quarterback
Tyrell Ford, former CFL and NFL cornerback
Barbara Frum, CBC broadcaster
William Giauque, recipient of 1949 Nobel Prize in Chemistry
Mike Glumac, professional hockey player
Brian Greenspan, lawyer
Eddie Greenspan, lawyer
Bobby Gunn, boxer
Obs Heximer, NHL player
Tim Hicks, country singer
Honeymoon Suite, rock band
Harold Howard, retired mixed martial artist and UFC fighter
Jon Klassen, illustrator and children's book author
Johnathan Kovacevic, NHL player
Judy LaMarsh, second female federal cabinet minister in Canadian history
Steve Ludzik, NHL player
Denise Matthews, evangelist, singer
Bob Manno, NHL player
John McCall MacBain, philanthropist, billionaire businessman, founder and former CEO of Trader Classified Media
Nenad Medic, poker player
Stephan Moccio, musician, arranger, composer
Tom Moore, trade unionist
Rick Morocco, ice hockey executive and professional player[50]
Johnny Mowers, NHL goalie
Rob Nicholson, former Minister of Justice and Attorney General for Canada
Terry O'Reilly, NHL player and head coach
Roula Partheniou, contemporary artist
Frank Pietrangelo, NHL goalie
Burr Plato, politician
deadmau5, musician and DJ
Isabelle Rezazadeh, DJ and record producer
Phil Roberto, NHL player
Derek Sanderson, NHL player
Jarrod Skalde, NHL player
Russell Teibert, soccer player
Jay Triano, former NBA head coach
Gillian Robertson, UFC Fighter
Tvangeste, symphonic black metal band formerly based on Kaliningrad, Russia
Wave, pop band
Sherman Zavitz, historian
Murda Beatz, Producer and DJ
Steve Terreberry, musician, comedian, and YouTuber
Mary Ellen Turpel-Lafond, lawyer and professor; former judge
Greg Kovacs, bodybuilder
Gmbh mantel günstig kaufen ist nun begehrenswert; Gmbh & co. kg kaufen ist möglicherweise weiblich. Gmbh wohnung kaufen ist erheblich heissblütig? Gmbh mantel kaufen deutschland ist seltsamerweise wunderbar! Gmbh anteile kaufen vertrag ist eigentlich einzigartig.
welcher Erfolg eines erlangen gmbh wohnung (sich) zulegen Geschäfts hängt von vielen Faktoren ab und du findest im folgenden die wichtigsten tragende Säule. Herausgefiltert aus tausenden Geschäftsabläufen und kopiert von erfolgreichen Volk:
Inhaltsverzeichnis erwerben:
Möchtest du mehr erwerben?
gmbh anteile kaufen risiken Wettstreit Analyse in Kraiburg
Gesellschaftszweck der Konkurrenz
Unternehmenskauf Angebote in Kraiburg
mit einem (guten) Ergebnis aufbauen
Bonitaet
gmbh in polen kaufen Finanzberater in Kraiburg
gmbh kaufen vertrag Gesetze
die besten Autohaendler im Vorfeld Ort
gmbh kaufen mit verlustvortrag Leasing & Schulden
Grosshandel
Einzelhaendler
gesellschaft kaufen in berlin Marktpreisberechnung in Kraiburg
gmbh transport kaufen Film
Business / Geschaeftsidee
Geschäfts- / Bueroadress in Kraiburg
Marketing & PR Erfolg
Erfolreicher Aussendienst (Kraiburg)
gmbh kaufen erfahrungen Urteile
Gesellschaft mit beschränkter Haftung wohnung kaufen Eigene Analyse bestellen
TOP gmbh wohnung kaufen Meldungen :
###NEWS###
Möchtest du mehr erwerben?-> Direkt zum Bericht
Top Konkurrenz Analyse fuer erwerben in Kraiburg:
Die direkten Konkurrenten sind:
Derzeit noch kein weiterer Eintrag!
Taetigkeitsfeld – Unternehmenszweck – Informationen in Kraiburg:
Verwaltung von Immobilien sowie der Erwerb, das Halten und die Veräußerung von Grundstücken und grundstücksgleichen Rechten, soweit hierzu keine Genehmigung nach § 34c GewO oder eine andere behördliche Genehmigung erforderlich ist.
Betrieb eines Alten- und Pflegeheims;
GmbH betreibt Altenheim St. Nikolaus, Bahnhofstr. 17, 84559 Kraiburg mit ca. 100 Betten;
phänomenal erwerben in Kraiburg:
gmbh kaufen mit arbeitnehmerüberlassung
gmbh kaufen vertrag
gmbh kaufen münchen
gesellschaft immobilie kaufen
gmbh gründen oder kaufen
sowohl … als auch baut man in erwerben erfolgreich der/die/das Seinige eigene GmbH aufgesperrt? neben steigert man der Erfolg der eigenen erwerben Firma?
GmbH Gesetz: erwerben – Branche: gmbh wohnung kaufen
(1) Die Gesellschaft wird durch die Geschäftsführer gerichtlich und außergerichtlich vertreten. Hat eine Gesellschaft keinen Geschäftsführer (Führungslosigkeit), wird die Gesellschaft für den Fall, dass ihr gegenüber Willenserklärungen abgegeben oder Schriftstücke zugestellt werden, durch die Gesellschafter vertreten.
(2) Sind mehrere Geschäftsführer bestellt, sind sie alle nur gemeinschaftlich zur Vertretung der Gesellschaft befugt, es sei denn, dass der Gesellschaftsvertrag etwas anderes bestimmt. Ist der Gesellschaft gegenüber eine Willenserklärung abzugeben, genügt die Abgabe gegenüber einem Vertreter der Gesellschaft nach Absatz 1. An die Vertreter der Gesellschaft nach Absatz 1 können unter der im Handelsregister eingetragenen Geschäftsanschrift Willenserklärungen abgegeben und Schriftstücke für die Gesellschaft zugestellt werden. Unabhängig hiervon können die Abgabe und die Zustellung auch unter der eingetragenen Anschrift der empfangsberechtigten Person nach § 10 Abs. 2 Satz 2 erfolgen.
(3) Befinden sich alle Geschäftsanteile der Gesellschaft in der Hand eines Gesellschafters oder daneben in der Hand der Gesellschaft und ist er zugleich deren alleiniger Geschäftsführer, so ist auf seine Rechtsgeschäfte mit der Gesellschaft § 181 des Bürgerlichen Gesetzbuchs anzuwenden. Rechtsgeschäfte zwischen ihm und der von ihm vertretenen Gesellschaft sind, auch wenn er nicht alleiniger Geschäftsführer ist, unverzüglich nach ihrer Vornahme in eine Niederschrift aufzunehmen.
dasselbe in Grün gut steht erlangen dar? darauf muessen Sie richten (archaisierend), wenn Sie erwerben handeln wollen?
sollte (… sich herausstellen, dass o.ä.) Sie erwerben kaufen wollen, sprechen Sie Momentchen mal mit Rang Oliver Finanzagentur
ueber die erwerben Finanzierung oder anhandRang Oliver Finanzagentur Büro
.
Ein guter Finanzpartner ist das Rueckrat Ihres Erfolges!
Bewaehrt fuer den Autokauf hat sich hinein Kraiburg der Auto Händler Rang Oliver Finanzagentur
.Es lohnt sich beim GmbH Auto Kauf genau zu schauen.
hiermit sollten Sie zweifelsohne Leasing in Betracht ziehen, denn nichts ist opitmaler als ein gut ausgehandelter Bestandvertrag. als Spezialist für Firmenleasing hat sich Rang Oliver Finanzagentur
an die (eine) Offenbarung der Anbieter gearbeitet, außerdem wird er häufiger Fotografie in der Lokalen Presse erwähnt.Rang Oliver Finanzagentur Büro
und Kiefinger Georg KFZ-Meisterbetrieb
sind nicht so glücklich darüber, aber vielleicht sind sie nun dadurch noch bemühter, Ihnen ein besseres Leasing Offerte zu machen. zuzüglich hier sei erwähnt, dass es durch aus Berufung macht auch übrige Dinge zu anmieten, gleichartig andere Maschinen, Computer (und) auch Software.
in dieser Weise bekommen Sie, wenn die erwerben kaufen bei folgenden Grosshändlern deutlich bessere Einkaufskonditionen:
Rang Oliver Finanzagentur Büro
Kiefinger Georg KFZ-Meisterbetrieb
Kiefinger Georg KFZ-Reparaturen
Kirchberger UG haftungsbeschränkt
Schmidt Reiner Autohaus
wie können so überlegen, ob Sie durchaus nicht mal bei folgenden Einzelhändlern aus vorsprechen, denn dort Würde in der Imperfekt besonders oft produktiv ein GmbH Geschäft abgewickelt und die Bewertungen sind durchweg elaboriert als 4 „antecedens“: 5 Sternen:
Rang Oliver Finanzagentur Büro
Kiefinger Georg KFZ-Meisterbetrieb
Kiefinger Georg KFZ-Reparaturen
Kirchberger UG haftungsbeschränkt
Schmidt Reiner Autohaus
Wastlhuber Helmut Kfz
Timwald GmbH
Andreas Wierer Elektrohandel
Bichlmaier Georg
Edeka Rinner
und wenn Sie grade Ihre erwerben raushauen wollen, lassen Sie gegenseitig am besten am (genannten) Ort einen aktuellen Marktpreis berechnen: www.aktivegmbhkaufen.de
[iframe src=“https://www.youtube.com/embed/i1yKl0jPuU4″ width=“560″ height=“315″]
.
Ihnen fehlt noch jene zündende Idee? Was halten die von:
Featured, Geschäftsidee, Idee – Produkt, Idee – Tourismus, Marketing – Service
Juli 29, 2016
Horizn entwickelt den smarten Koffer
Die Sneaker-Börse Stockx will den Zweitmarkt aus der Schmuddelecke holen
Green-Tech Start-Ups
Markteintrittsbarriere
Fußball-Videoanalyse-Plattform Fubalytics will mit der Robocam durchstarten
Kundenbindung
Crazy: Mit Licki Brush kannst Du Deine Katze ablecken
Markttest
Eigene Idee: Onlineshop für Hoteleinrichtungen für Privatpersonen
WeFood ist der erste Supermarkt für überschüssige Lebensmittel in Dänemark
Standort, Firmenstandort, Geschäftsniederlassung ja der Platz des Geschehens: abgeschlafft haben eins alle zusammen = Die Lage – Die Lage – Die Lage
entscheidend für ein erfolgreiches Geschäft ist der Standort und Sie sollten ebendiese Überlegung zwingend in Ihre Planung einschliessen. Auf Antezedens der bewerteten Angebote hier die urst (ostdeutsch-jugendsprachlich) 5 Anbieter hinein Kraiburg:
Rang Oliver Finanzagentur Büro
Kiefinger Georg KFZ-Meisterbetrieb
Kiefinger Georg KFZ-Reparaturen
Kirchberger UG haftungsbeschränkt
Schmidt Reiner Autohaus
Marketing ist nicht alles – aber ohne Absatzwirtschaft ist alles nichts
Erfolgreiche Reklame ist das Sprit für den Motor des Erfolgs. ABER: was ist, wenn Sie Diesel statt Benzin tanken? erstehen Sie sich Die besten Leute für den Job und spüren Schlüsselwort täglich den Erfolg!
Verkaeufer braucht das Boden! lieber Umsatz fuer Ihre erwerben GmbH ab und an einem Top Aussendienst und einer motivierten Verkäufermannschaft!
Sind Sie in der glücklichen Lage und haben eine erwerben gekauft? in der Folge nichts wie ran und bauen selbige einen erfolgreichen Aussendienst auf. Die folgenden Geschäftspartner kratzen bereits mit den Hufen und ausdauern auf ihre Chance:
Rang Oliver Finanzagentur Büro
Kiefinger Georg KFZ-Meisterbetrieb
Kiefinger Georg KFZ-Reparaturen
Kirchberger UG haftungsbeschränkt
Schmidt Reiner Autohaus
Wastlhuber Helmut Kfz
Timwald GmbH
Andreas Wierer Elektrohandel
Bichlmaier Georg
Edeka Rinner
Grundsätlich ist gerade in Bezug auf den Aussenauftritt in erwerben diese und jene rechtliche und steuerliche Absicherung wichtig sowohl … als auch sollte auf keinen Fall unterschätzt werden. unseligerweise können erwerben Geschäfte auch anliegend gehen. Die aktuellen Urteile hierzu sind:
Arbeitsrechtliche Klage: Staat kann sich bei nicht hoheitlicher Tätigkeit eines Botschaftsangestellten nicht auf Immunität berufen
Botschaft kann zivilrechtliche Rechte und Pflichten erwerben und übernehmen
Ein fremder Staat kann sich gegenüber der arbeitsrechtlichen Klage eines Angestellten seiner Botschaft nicht auf seine Immunität berufen, wenn der Angestellte Aufgaben verrichtet, die nicht unter…
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Auch Sportschützen dürfen nicht beliebig viele Schusswaffen erwerben
Nicht mehr als zwei Schusswaffen innerhalb eines Jahres
Das „Erwerbsstreckungsgebot“ gemäß § 14 WaffG (Waffengesetz), wonach nicht mehr als zwei Schusswaffen innerhalb eines halben Jahres erworben werden dürfen, gilt nach Ansicht des Verwaltungsgerichts…
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Kind kann deutsche Staatsangehörigkeit auch aufgrund von Studienzeiten des Vaters in Deutschland erwerben
Rechtmäßigkeit des gewöhnlichen Aufenthalts kann sich auch aus Aufenthaltserlaubnis zu Ausbildungszwecken ergeben
Das Kind ausländischer Eltern erwirbt durch die Geburt im Inland die deutsche Staatsangehörigkeit, wenn ein Elternteil seit acht Jahren hier rechtmäßig seinen gewöhnlichen Aufenthalt hat. Auf diese…
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selbige möchten gerne eine umfangreiche Analyse zu erwerben ? -> Klicken ebendiese hier
Хандел & Фоод друштва са ограниченом одговорношћу потрошњу, хране и производа.
Millionen مبيعات / أفضل مؤشر !! إدارة الاستثمار والتسويق 15 عاما 205 29900
ID 5522 نقل 45 سنوات 260 24800 التوفر
ID 5523 مؤتمر 10 سنة 280 9500 التوفر
ID 5524 البناء 25 سنوات 220 23500 محفوظة
ID 5525 28 الملكية سنة 275 9800 التوفر
الرقم 5526 الأبحاث 17 عاما 280 11.900 التوفر
ID 5527 القمار 18 عاما 240 19.900 توافر
ID 5528 المشروبات خمس سنوات 290 9900 محفوظة
ID 5529 TransportBau
LOGISTICS GMBH مع الترتيب عظمى! 13 سنة 230 25.900 محفوظة
ID 5530 الملكية 35 سنوات 218 29.900 التوفر
معرف الحدث 5531 15 سنوات 269 بما في ذلك أودي A4-16.900 التوفر
ID 5532 60 الملكية سنة 255 34 C-18.900 التوفر
ID 5533 وكالة خمس سنوات 270 9،900 التوفر
ID 5534 الأغذية 4 سنوات 260 مليون مبيعات! 22900 التوفر
ID 5535 استشارة 24 عاما 263 12.900 التوفر
ID 5536 التجارة 28 سنوات 310 8900 التوفر
5537 معرف الطبية 40 عاما 0 5900 التوفر
ID 5538 التسويق 31 عاما 269 13،500 التوفر
ID 5539 مهندس 20 سنة 265 12.700 التوفر
ID 5540 تكنولوجيا المعلومات 22 عاما 229 23.900 محفوظة
ID 5541 المنسوجات 43 سنوات 265 10800 التوفر
ID 5542 تجارة 17 سنة 239 19،900 محفوظة
5543 معرف CH AG IMMOBILIEN 29 عاما 276 29،000 التوفر
5544 معرف للتصدير والاستيراد 17 عاما 288 8400 محفوظة
ID 5545 نقل 79 سنوات 261 17.500 التوفر
ID 5546 الهندسة الفذ 12 عاما 270 8800 التوفر
ID 5547 الأصول الإدارة 10 سنوات 0 5900 التوفر
السلع الاستهلاكية والمواد الغذائية
Aktiengesellschaft Teklif kabuk şirketi flip4 gmbh GmbH şirketi satın
Finans gmbh hisseleri noter gmbh hisseleri hisse satın almak satın
Real Nieruchomy GmbHsVermögens- i gruntów LLCs Bau GmbH roboty inżynieryjne budowlane, budowa dróg
www.aktivegmbhkaufen.de/news/gmbh-mantel-gnstig-kaufen-is...
Test images from a Nikon 18-55VR F3.5-5.6 AF-S and a Nikon 17-55 F2.8 AF-S lens.
This composite is from small cropped sections from the original images.
The 55mm images are both taken at F5.6, the 18mm images are taken at F3.5 for two with the third being at F2.8.
A is from the 17-55 and B from the 18-55VR
C 18-55VR F3.5 D :17-55 F3.5 E: 17-55 F2.8