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The Námafjall Geothermal Area is located in Northeast Iceland, on the east side of Lake Mývatn. At this area, also known as Hverir, you will see many smoking fumaroles and boiling mud pots, surrounded by sulphur crystals of many different colours. This sulphur gives the area an overwhelming smell of egg.
Hverir 20210720
Hverir is one of the most active geothermal areas in all of Iceland. Also known as Hverarönd, this region stands out for its ochre-colored landscapes and the numerous fumaroles and boiling mud pools dotted over its moon-like terrain.
Despite the intense smell of sulfur, its curious geothermal activity entices visitors to walk along Hverir's trails and marvel at the natural wonders of Earth. Due to the high heats of the subsoil at Hverir, it's very important not to leave the signposted paths, both to preserve the impressive landscapes and to avoid getting burned by the steam from the fumaroles or putting your foot in a boiling mire!
Source Civitatis Iceland.
Yellowstone Lake
Yellowstone National Park
Wyoming
The holes are dormant fumaroles, which sometimes vent steam or gases.
From the 2021 archives.
Thanks for stopping by!
© Melissa Post 2025
A mud pool or mud pot, is a sort of acidic hot spring or fumarole with limited water. It usually takes the form of a pool of bubbling mud. The acid and microorganisms decompose surrounding rock into clay and mud.
The mud takes the form of a viscous, often bubbling, slurry. As the boiling mud is often squirted over the brims of the mud pot, a sort of mini-volcano of mud starts to build up, sometimes reaching heights of 3-5 feet. The mud is generally stained with reddish or pink spots from iron compounds.
Info from Wikipedia
The above mud pool is located in the Haukadalur Valley at the base of Laugarfjall hill near the famous Strokkur Geyser.
Image taken while standing behind the rope.
Thank you for your comments,
Gemma
A fumarole in the high-temperature geothermal field of Namaskard (near Akureyri), Iceland.
For a high resolution full screen view of my photos, please visit: www.pictographica.net
UPDATED: 14th August, 2017
Explore Nov 25, 2008 # 118
Le fumarole alle prime luci dell'alba sull'altipiano inospitale di Sol de Mañana a 5000 metri slm e -21°C.
Fumaroles at the peep of day in the inhospitable highlands of Sol de Mañana, 5000 mt above sea level and - 21C.
The shy vicuñas are known for their soft and valuable fur. With their long, silky coats and slender builds, vicuñas are impressive animals that live in the high Andean highlands.
They belong to the Camelidae family.
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Die scheuen Vicuñas sind bekannt für ihr weiches + wertvolles Fell. Mit ihrem langen, seidigen Fell und ihrem schlanken Körperbau sind die Vicuñas beeindruckende Tiere, die in den Hochebenen der Anden leben.
Sie gehören zur Familie der Camelidae.
Yellowstone's Norris Geyser Basin is the hottest spot in the park, closest to the hot magma not far below. Pictured here is the Colloidal Pool in the Porcelain Basin of this large geothermal wonder.
Quite the memorable experience walking thru here with all the geysers, boiling pools and fumaroles belching sulphuric steam. I found it a bit eerie, yet can't wait to return.....
Thanks for your visit. Always appreciated.
Enjoy a wonderful weekend!
This photo always reminds me of that Tolkien's phrase. The lava fields of Krafla, from the eighties, are a huge desolation that reaches to the horizon, sprinkled with craters and fumaroles. Krafla - Iceland 2018
Hverir is a lunar-like landscape of mud cauldrons, steaming vents, radiant mineral deposits and piping fumaroles. Belching mudflaps and the powerful stench of sulphur may not sound enticing, but Hverir’s ethereal allure grips every passer-by.
The fumaroles at Steamboat Point are the first major thermal features a visitor will encounter when entering Yellowstone National Park from the East Entrance. Fumaroles are vents or openings at the surface where volcanic gases and vapors are emitted. Faint to loud roars and hissing can be heard as the gas escapes the vent. Most of the vapor emitted by fumaroles is steam, formed as groundwater circulates deeply through heated rock. The water vapor mixes with volcanic gases given off by magma deep below in Yellowstone’s caldera. These volcanic gases include sulfur compounds, such as various sulfur oxides and hydrogen sulfide which accounts for the sulfur or “rotten egg smell” visitors may notice. There are no geysers that erupt water here. The fumaroles at Steamboat Point are some of the thermal features associated with the Marys Bay hydrothermal explosion crater that forms this rounded bay on the northeast side of Yellowstone Lake. There are several such hydrothermal explosion craters scattered across Yellowstone National Park in Wyoming. They range from tens of feet to more than a mile across. This one at Marys Bay is not only the largest hydrothermal explosion crater documented in Yellowstone but it is also the largest in the world. It measures 1.5 miles (2.6 km) in diameter and forms an embayment on the north side of Lake Yellowstone. The crater, which formed 13,800 years ago, may have been the result of several separate explosions over a short period of time. The cause or trigger for these hydrothermal explosions are not fully understood but pressure release due to glacial melting, earthquakes, or rapid changes in lake levels could be significant factors. Geological studies have found that these large, violent hydrothermal events are independent of associated volcanism. In the past 16,000 years, none of these events have been followed by an eruption of magma. The deeper magma systems seen unaffected by these sometimes spectacular steam explosions in their overlying hydrothermal systems.
A steam vent, or fumarole, is an opening in a planet's crust, often in areas surrounding volcanoes, which emits steam and gases. The steam forms when superheated water vaporizes as its pressure drops when it emerges from the ground.
On this day, I was surrounded by clouds both above and below.
Wairakei ‘Craters of the Moon’ geothermal area is part of the largest geothermal field in New Zealand. It lies within the Taupō Volcanic Zone.
Despite being on raised wooden boardwalks, one can feel the heat of the Earth while exploring this geothermal valley hissing with clouds of steam and cauldrons full of bubbling mud. It is fascinating how flora and fauna have evolved to exist happily in such extreme conditions.
It is a thrilling and intriguing place.
The thermal activity is monitored regularly by scientists from the Institute of Geological and Nuclear Science.
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When I asked my daughter for the place she liked the most on our 2015 round trip, she said immediatly "The boiling mud pots and steam vents". This 2026 photo is dedicated to her.
Namafjall is a volcanic mountain and geothermal area in North Iceland, famous for its steaming fumaroles, boiling mud pools, and colorful mineral-stained landscapes.
Iceland - an island of fire and water. Everywhere one looks snow remains bizarre rock formations as well as geysers, fumaroles and Schlammpötten a color full of dramatic scenes. A volcanic island full of magic and variety.
This runoff channel drains Seltúnshverir, the thermal basin at Seltún on the Reykjanes Peninsula in Iceland. The thermal area contains solfataras (fumaroles), mud pools and steaming ground and hot springs pools.
Seltún is part of the large Geothermal field which lies on the NE-SW trending Krýsuvík volcanic system. This system is one of the volcanic zones that lie along the fissure zones on the Mid-Atlantic Ridge which traverses Iceland.
Seltún is located in the Reykjanes Geopark.
References:
Geologic and geothermal info from Iceland GeoSurvey (ISOR) . Some text in the caption from their web page at: www.geothermal.is/17-seltun-high-temperature-area-solfataras
The Reykjanes peninsula is a region particularly rich in geothermal phenomena due to the high level of volcanic activity. The mid-Atlantic ridge rises to the surface in the Krysuvik region, and there are numerous lava fields, fissures, solfataras, mud pots and other hot springs. This volcanic activity can be seen in particular at the Seltún site.
Steam rises from fumaroles at Seltúnshverir on the Reykjanes Peninsula, Iceland. This thermal area lies Just off the road to Krýsuvík at Seltún. The solfatara field contains fumeroles, hot springs, mud pools and steaming ground. Fumeroles are the dominate thermal feature and deposit sulfur and sulphates on the ground near the vents. Fumeroles whose steam is rich in sulpur are called solfataras. The main sulphur aree is a fumerole field that lies southwest of the boardwalk at Seltún but sulphur and sulphates are found in at least small amounts around most of the steam vents, mud pools and acidic hot springs. Yellow patches on the ground were visible to us as we strolled along the boardwalk.
Seltún is part of the large Krýsuvík Geothermal field which lies on one of the NE-SW trending volcanic systems that cross the Reykjanes Peninsula. in Iceland. The volcanic zones lie in the middle of the fissure zone on the Mid-Atlantic Ridge which traverses Iceland and are visible along the south of Reykjanes in the middle of the fissure zone on the Mid-Atlantic Ridge which traverses Iceland and is visible along the south of Reykjanes.
In the mid-20th century there were plans to develop the geothermal field for utilisation, including power production, and Seltún then became one of the main drilling targets. There are old drill pads to be seen near the path along the creek. According to the Iceland Geosurvey (ISOR) one of the "boreholes started erupting intermittently in the winter of 2010". They reported that an interval of a few days between the eruptions. We found the spot but on two different visits to the field I saw no sign of geyser activity. ISOR also reports "another old borehole blew up in 1999 forming a crater with a diameter of about 30 m, now filled by mud except where a flow of steam keeps boiling pits open". That unexpected explosion in 1999 reportly caused the geothermal project to be halted. The springs have been preserved due to the lack of drilling and geothermal exploitation.
Temperatures are over 200 degrees C just below the suface. Geologist from the Iceland Geosurvey believe "the water of the pools is surface water heated by steam from a boiling geothermal reservoir. Accompanying gases such as hydrogen sulphide and carbon dioxide acidify the water and alter the rock to clay. Only the uppermost 300 m of the reservoir at Seltún is boiling, i.e., follows the boiling curve in accordance with increasing pressure. Below this depth, a temperature inversion occurs, indicating that the boiling section is fed laterally from an upflow some distance away."
Feference:
Geologic and geothermal info from Iceland GeoSurvey (ISOR) . Some text in the caption from their web page at:http://www.geothermal.is/17-seltun-high-temperature-area-solfataras
To feel the heat of Iceland, go to Hverir, a large geothermal field of bubbling mudpots, hissing fumaroles and sticky red soil. Fumeroles are openings in the Earth’s crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, hydrogen chloride, and hydrogen sulfide. This one was emitting steam and hissing loudly.
Lassen Volcanic National Park is home to steaming fumaroles, clear mountain lakes, and numerous volcanoes.
Námafjall 20210720
At the foothills of this spectacular volcanic mountain is an expanse of hot springs called Hverir that are known for their variety. You will also discover fumaroles, mud pools, and mud pots that all seem to be boiling with relentless energy. The pass Námaskarð is strategically located at a short distance from the Krafla volcano system as well as other interesting geological spots like Búrfellshraun lava field and the desert Mývatnsöræfi.
Námaskarð earns its notoriety chiefly because of its sulfurous mud springs called solfataras and steam springs called fumaroles. Though you will scarcely find any pure water spring in this wonderful geothermal site of Iceland, the beauty of the colorful minerals defies all comparison. The gigantic size of the mud craters is what makes you go 'wow' at the sight of them.
The other thing that is sure to strike you about Námaskarð is the sheer lack of vegetation. The constant emission of the fumes has made the ground utterly sterile and acidic, unfit to sustain any floras and faunas. You must bear in mind that the fumes can be harmful to humans as well.
Source: Visit North Iceland.
I didn't know before that Taiwan has hot springs and fumaroles. These workers are repairing a path in the Xiaoyoukeng Recreation Area next to fumaroles.
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Runa Photography, Daniel © 2023
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Ollagüe (Spanish pronunciation: [oˈʎaɣwe]) or Ullawi (Aymara: [uˈʎawi]) is a massive andesite stratovolcano in the Andes on the border between Bolivia and Chile, within the Antofagasta Region of Chile and the Potosi Department of Bolivia.
Part of the Central Volcanic Zone of the Andes, its highest summit is 5,868 metres (19,252 ft) above sea level and features a summit crater that opens to the south. The western rim of the summit crater is formed by a compound of lava domes, the youngest of which features a vigorous fumarole that is visible from afar.
Source: wikipedia
At the foothills of this spectacular volcanic mountain is an expanse of hot springs called Hveraröndor Hverir that are known for their changing variety. You may also find a number of fumaroles, mud pools and mud pots that all seem to be boiling with relentless energy. The pass Námaskarð is strategically located at a short distance from the Krafla volcano system as well as other interesting geological spots like Búrfellshraun and the desert Mývatsöræfi.
Námaskarð earns its notoriety chiefly because of its sulphurous mud springs called solfataras and steam springs called fumaroles. Though you will scarcely find any pure water spring in this wonderful geothermal site of Iceland, the beauty of the colorful minerals defies all comparisons. The gigantic size of the mud craters is what makes you go 'wow' at the sight of them.
The other thing that is sure to strike you about Námaskarð is the sheer lack of vegetation. However, if you give a thought to the high temperature range, it does not appear an impossibility altogether. The constant emission of the fumes has made the ground utterly sterile and acidic, unfit to sustain any floras and faunas. You must bear in mind that the fumes can be harmful for humans as well.
Visit my Iceland photostream : www.flickr.com/photos/ddelion/sets/72157624606038805/
New mudpot in the Námafjáll site, Iceland.
Nouvelle marmite de boue dans le site de Námafjáll, Islande.
A little bit of volcanic activity with some hot gasses escaping from this fumarole in Lassen Volcano National Park in California. As of August 2021, the entire national park is closed due to the Dixie Fire, which is closing in on half a million acres.
The massifs of rhyolite in the Kerlingarfjöll area.
Les massifs rhyolitique des Kerlingarfjöll près de la piste de Kjolur.
Haukadalur is a geothermal valley in South Iceland on the popular Golden Circle route. Lying to the north of Lake Laugarvatn, it is home to hot springs, fumaroles, mud pots and geysers, including the famous Great Geysir and the active Strokkur. The area is noted for the vivid colouration of its surrounding hills, caused by elements deep in the earth being brought to the surface by the geothermal activity.
Hot pools and steaming ground are found near the erupting spring in the Gunnuhver Group at the Gunnuhver Thermal Area on the Reykjanes Peninsula, Iceland. The development of a Geothermal power plant in 2006 effected the hydrothermal features. Steaming of the ground at Reykjanes increased markedly as a consequence of pressure drawdown in the geothermal reservoir after exploitation. Some boreholes drilled during development became steam vents or mud pools.
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Námafjall is a geothermal area located east of Lake Myvatn, looking like a mixture of an alien landscape and the Hell from Dante’s Inferno. Located at the base of a towering volcanic mountain, this site features a large collection of boiling mud pots and steam springs called fumaroles, which are openings in the ground that emit sulfurous gases.
Námaskarð, noto anche come Hverir, è un'area geotermica situata nella parte nord-orientale dell'Islanda, vicino al lago Myvatn. È caratterizzata da un paesaggio surreale e affascinante, con pozze di fango ribollenti, fumarole fumanti, e vasti campi di solfatare che emettono un forte odore di zolfo. La terra è colorata da sfumature di giallo, rosso e marrone, dovute alla presenza di diversi minerali. Námaskarð offre uno spettacolo naturale unico, dove l'attività geotermica intensa crea un'atmosfera quasi aliena.
Námaskarð, also known as Hverir, is a geothermal area located in northeastern Iceland, near Lake Myvatn. It is characterized by a surreal and fascinating landscape, with bubbling mud pools, steaming fumaroles, and vast solfataric fields emitting a strong smell of sulfur. The ground is colored with shades of yellow, red, and brown, due to the presence of various minerals. Námaskarð offers a unique natural spectacle, where intense geothermal activity creates an almost alien atmosphere.