A sand DUNE is a hill or ridge of wind-blown sand formed by the wind in an area where there is little vegetation. The term 'DENE' is an alternate spelling of 'DUNE, ' which is derived from the Middle Dutch word 'duin.' Dunes are typically found in deserts, on beaches, and in other areas with loose sand. They can range in size from small mounds to large hills, and they can be found in many different shapes and sizes.