A desert region in SW Africa, largely in Botswana. 100,000 square miles. Covered largely by reddish sand, the Kalahari lies between the Orange and Zambezi rivers and is studded with dry lake beds. Its human inhabitants are mainly San, who are nomadic hunters, and Khoikhoi, who are hunters and farmers. Tswana herders have moved into the area and the Kalahari has become a popular tourist destination.