Where are barchan dunes commonly found?

Barchan dunes are characteristically found in open, inland desert regions across the world. These crescent-shaped sand dunes occur in areas where the regional wind blows consistently from one direction, which is essential for maintaining their distinct shape.12

They typically appear as groups of isolated dunes on hard desert surfaces, though they may also form chains that extend across plains in the direction of the prevailing wind. While they are one of the most common types of dunes on Earth, they have also been identified on Mars.12