In physical geography, a dune is a hill of sand built by aeolian processes. Dunes occur in different forms and sizes, formed by interaction with the wind.
Large dune fields are known as ergs.
In most cases the dunes are important in protecting the land against potential ravages by storm waves from the sea.
Aeolian dune shape :
Crescentic
Linear
Star
Dome
Parabolic
Longitudinal (Seif) dunes
Reversing dunes
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