Original: 02 January 2005 is a large arid to semi-arid sandy area in Southern Africa extending , covering much of Botswana and parts of Namibia and South Africa , as semi-desert , with huge tracts of excellent grazing after good rains .
Simplified: The Kalahari Desert is a large arid to semi-arid sandy area in southern Kgalagadi Africa extending 900,000 km ( 362,500 sq .