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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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