I call this a beautiful world hell. Beautiful shape, but located in the very hot and dangerous place. Dune is a hill of sand built by Aeolian processes, usually with variety of beautiful shape. Dunes also form under the action of water flow (alluvial processes), on sand or gravel beds of rivers, estuaries and the sea-bed.
Some shape of dunes, including:
1. Crescentic, generally wider than they are long. The slipfaces are on the concave sides of the dunes.
2. Linear, Straight or slightly sinuous sand ridges typically much longer than they are wide are known as linear dunes.
3. Star. Radially Symmetrical, star dunes are pyramidal sand Mounds with slipfaces on three or more arms that radiate from the high center of Mound.
4. Dome, oval or circular Mounds that generally lack a slipface, dome dunes are rare, and these occur at the far upwind margins of sand seas.
5.Parabolic, U-shaped Mounds of sand with convex noses trailed by elongated arms are parabolic dunes.
Dunes are one of Sahara’s beauties. Sahara Desert is the largest desert in the world and covers most of Northern Africa. The Sahara covers huge parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia. Be able to reach you through any country.