In physical geography, a dune is a hill of sand built either by wind or water flow. Dunes occur in different forms and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The valley or trough between dunes is called a slack. A "dune field" is an area covered by extensive sand dunes. Large dune fields are known as ergs.

Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach. In most cases the dunes are important in protecting the land against potential ravages by storm waves from the sea. Although the most widely distributed dunes are those associated with coastal regions, the largest complexes of dunes are found inland in dry regions and associated with ancient lake or sea beds.

Dunes also form under the action of water flow (fluvial processes), and on sand or gravel beds of rivers, estuaries and the sea-bed.

en.wikipedia.org/wiki/Sandbanks_Provincial_Park

Another oasis in the Ubari sand sea

After man nature still works away.One of the cuttings of the seaward dunes.

I trekked the desert-like sand dunes of Barangay La Paz of Laoag City (Ilocos Norte, Philippines) for three hours under a scorching sun once. I just wanted to recon. Need to go back soon for better shots.

Got this one idea for a shoot there. Gonna keep it secret for a while. ;-) Just come visit this gallery again soon.

Taken at The Great Sand Dunes National Park, south west Colorado.

You can either rent a plastic magic carpet or an ATV... it was a no brainer for Rush.

Our Road Trip in Western Australia

massively overexposed due to sticky shutter. hats off to Ilford, this film has an incredibly straight H-D curve

Sand dune 1998 by M A Felton

Rippling Sand and Sky. all of these pics are taken between midnight and 0300hrs, best time for long exposure work as the moon has usually set and there is no sun light sneaking round the curve of the earth.

Silver Lake Sand Dunes.

Hokianga sand dunes in the background

Sand Boarding 2015

A lone visitor explores the eerie terrain of Colorado's Great Sand Dunes Naitonal Park.

The candidates of Miss Ilocos Norte joined the dancers at Himala sa Buhangin! 2015 at Paoay sand dunes, Ilocos Norte held May 1, 2015.

Himala sa Buhangin! 2015. Paoay sand dunes, Ilocos Norte. May 1, 2015. #Himala2015 www.ilocosnorte.gov.ph/ www.facebook.com/HimalaSaBuhanginIN / www.facebook.com/IlocosNorteOfficial / www.facebook.com/ImeeMarcos / www.flickr.com/photos/ilocosnorte / media[at]ilocosnorte[dot]gov[dot]ph (PGIN CMO Photo/ Alaric A. Yanos)

A dune at Sandbanks Provincial Park on the Canadian Thanksgiving.

Nimibia Sand Dunes