A desert plateau region of southern Botswana, eastern Namibia, and western South Africa. Fed by seasonal rains, it has sandy soil and supports grass and other vegetation in all but the extreme southwestern corner.
Desert plateau in S Africa, mostly in Botswana: c. 350,000 sq mi (906,497 sq km)
See also Campbell's Travels in South Africa (London, 1815), Arbousset and Daumas ' Relation d'un voyage d'exploration au nord-est de la colonie du Cap de Bonne Esperance en 1836 (Paris, 1842), and Farini's Through the Kalahari Desert (London, 1886).
The air is unusually dry, owing to the proximity of the Kalahari Desert on the west and to the interception on the east by the Drakensberg of the moisture bearing clouds from the Indian Ocean.
in the year, but it diminishes rapidly towards the centre of the plateau where it averages, at Johannesburg about 30 in., 2 while in the extreme west as the Kalahari is approached it sinks to about 12 in.
The western region, the Kalahari Desert, is mainly arid, with a sandy soil, and is covered in part by dense bush.
The greater part of Bechuanaland is covered with superficial deposits consisting of the sands of the desert regions of the Kalahari and the alluvium and saliferous marls of the Okavango basin.