What is cover about a 100,000 square mile of Southern Africa

The Sahara, the largest hot desert in the world, covers 3.3 million square miles and is located in the northern part of Africa. The Kalahari Desert, located in southern Africa, covers 362,500 square miles. The Namib Desert, the world's oldest desert, is found in the southwestern portion of the continent and covers 100,000 square miles.