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 Desert and South Africa, and encroaching into parts of Angola, Zambia and Zimbabwe. North and east, approximately where the dry forests, savannahs and salt lakes prevail, the climate is sub-humid rather than semi-arid. South and west, where the vegetation is predominantly xeric savanna or even a semi-desert, the climate is "Kalaharian" semi-arid. The Kalaharian climate is subtropical (average annual temperature greater than or equal to 18 °C, at peaks reaching 40 °C and above, with mean monthly temperature of the coldest month strictly below 18 °C), and is semi-arid with the dry season during the "cold" season, the coldest six months