Chech

a sandy desert region in the Sahara, in southwestern Algeria and northern Mali. The Chech is situated in the lowlands between the plateaus of El Eglab and Tanezrouft. Dunes up to 300 m high are common in the northern part. South of 25°, chains of dunes about 50 m high fan out toward the west. Annual precipitation totals less than 10 mm. There are practically no springs or wells.