Dune

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Sand dunes in the Sahara desert region of Fezzan in Libya

In physical geography, a dune is a hill of sand, usually built by eolian processes (wind) or sometimes by the flow of water. Dunes occur, for example, in some deserts and beaches. Sand dunes have different forms and sizes based on their interaction with the wind. A "dune field" is an area covered by many sand dunes.