Kalahari Acacia-Baikiaea woodlands Kalahari Acacia-Baikiaea woodlands Kalahari Acacia-Baikiaea woodlands is an ecoregion located in Botswana, northern Namibia, South Africa and Zimbabwe. These woodlands cover the center of southern Africa, from northern Namibia diagonally through to southeast Botswana and just into the Tuli Block of South Africa. In Botswana there is another area running north from the Okavango Delta and the Makgadikgadi Pan towards the border of the Chobe National Park and then east to the border with Zimbabwe. All this is semi-arid sandveld with little surface water. Droughts occur approximately every seven years. Rainfall, when it occurs, is mostly in the summer, from
Kalahari Craton Archaean-Palaeoproterozoic core of the craton is called the Proto-Kalahari Craton. This core plus accreted Mesoproterozoic crust and dispersed non-African fragments compose the Kalahari Craton. Before the Pan-African Orogeny, the Kalahari Craton was much larger than it is today, but its sutures and therefore its extent are difficult to locate due to later overprinting. The Kaapvaal Craton, Zimbabwe Craton, and Limpopo Belt are made of Archaean terranes and contain crust at least 3.2 and are underlain by a thick () layer of buoyant mantle that is producing garnets and diamonds. During the Palaeoproterozoic the northwest margin of the Archaean core grew