The country is situated in the Southern African region and about two-thirds of Botswana lies within the Tropics; it is bisected by the Tropic of Capricorn The Kalahari Desert stretches west of the eastern hardveld, covering 84% of the country. The Kalahari extends far beyond Botswana’s western borders, covering substantial parts of South Africa, Namibia and Angola.
‘Desert’, however, is a misnomer: its earliest travellers defined it as a ‘thirstland’. Most of the Kalahari (or Kgalagadi, which is its Setswana name) is covered with vegetation including stunted thorn and scrub bush, trees and grasslands. The largely unchanging flat terrain is occasionally interrupted by gently descending valleys, sand dunes, large numbers of pans and, in the extreme northwest, isolated hills, such as Aha, Tsodilo, Koanaka and Gcwihaba. Many of the pans have dune systems on the southwest side, which vary in size and complexity. The pans fill with water during the rainy season and their hard surface layer ensures that the water remains in the pans and is not immediately absorbed. These pans are of great importance to wildlife, which obtain valuable nutrients from the salts and the grasses of the pans.
Although Botswana has no mountain ranges to speak of, the almost uniformly flat landscape is punctuated occasionally by low hills, especially along the southeastern boundary and in the far northwest. Botswana’s highest point is 1,491m Otse Mountain near Lobatse, but the three major peaks of the Tsodilo Hills, in the country’s northwestern corner, are more dramatic.