dune A low mound, ridge, bank, or hill of loose, windblown granular material (generally sand, sometimes volcanic ash), either bare or covered with vegetation, capable of movement from place but always retaining its characteristic shape.
Wikipedia
In physical geography, a dune is a hill of sand built by eolian processes. Dunes have different forms and sizes based on their interaction with the wind. A "dune field" is an area covered by many sand dunes.
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