Erg (landform)

Sand dunes in the Sahara desert (photography taken in January)

An erg (also sand sea or dune sea, or sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. An erg is defined as a desert area that contains more than 125 square kilometres (48 sq mi) of aeolian or wind-blown sand and where sand covers more than 20% of the surface.

Smaller areas are known as "dune fields".

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