It is crescentic in shape and it is formed from wind deposition in arid. The statement describes

The statement describes a barchan dune. A barchan dune is a crescent-shaped sand dune that is formed by the action of wind in arid and desert environments. Barchan dunes are formed by the unidirectional wind blowing across a flat surface, depositing sand on the windward side and causing it to migrate across the surface, with the apex of the dune facing downwind. Barchan dunes are common in areas with limited vegetation and a consistent wind direction. They can vary in size, from a few meters to several hundred meters in length. So, the statement describes a barchan dune which is formed from wind deposition in arid and desert environments, and is crescentic in shape.