- A barchan (barkhan dune) is an arc-shaped ( crescent-shaped) sand ridge.
- Comprising well sorted sand.
- produced by the action of wind predominately from one direction.
- These dunes are markedly asymmetrical in cross section.
- Gentle slope facing toward the wind and a much steeper slope, known as the slip face, facing away from the wind.
- these dunes migrates 100m per year.
- Barchans may be 9–30 m high and 370 m wide at the base perpendicular to the wind.
- They gradually migrate with the wind as a result of erosion on the windward side and deposition on the leeward side.
- barchan dunes usually occur as isolated dunes.
- these kind of inland regions originated by the The Russian naturalist Alexander von Middendorf in Turkistan 1881.
Examples:-
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- The largest barchan being at Parangkusumo Beach
- La Joya , Arequipa, Peru (16.714564°S 71.834083°W); a number of dunes are readily visible from the Pan American Highway at the intersection with the Carretera Interoceanica just north of La Joya
- south of the special region of Yogyakarta, Indonesia
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