. What are barchans Where are they found
It is crescent-shaped sand formed by the action of wind from one direction.
As a result of erosion on the windward side and deposition on the leeward side, they progressively migrate with the wind.
The rate of migration varies between a meter and a hundred meters per year. It can be found in deserts around the world where sand dunes occur.
The most famous of these is the Sahara desert in Egypt and the Gobi desert desert in Asia.