The Sahara, nearly the size of Brazil, is the world's largest hot desert.
Africa's northern bulge, the Sahara, covers 25% of the continent.
Ergs, regs, hamadas, and oases are among the Sahara's physical features.
Ergs, which encompass 20% of the Sahara, are long, 300-meter-tall sand dunes (1,000 feet).
Algeria, Libya, Mali, and Nigeria have ergs. Industrial and food salt can be found in ergs.
Hamadas are 3,353-meter-high rock and stone plateaus (11,000 feet).
75% of the Sahara's population lives in oasis, which cover only 2,071 square kilometres (800 square miles).