Kalahari Desert northwest, forming marshes that are rich in wildlife. Ancient dry riverbeds—called omuramba—traverse the central northern reaches of the Kalahari and provide standing pools of water during the rainy season. A semi-desert, with huge tracts of excellent grazing after good rains, the Kalahari supports more animals and plants than a true desert, such as the Namib Desert to the west. There are small amounts of rainfall and the summer temperature is very high. The driest areas usually receive of rain per year, and the wettest just a little over . The surrounding Kalahari Basin covers over extending further into Botswana, Namibia
Kalahari Craton by accretion and had formed a Proto-Kalahari Craton by 1.75 Ga. During the period 1.4–1.0 Ga subduction occurred along the northwest margin followed by continental collisions along the eastern and southern margins. By this time enough Mesoproterozoic crust had accreted to transform the Kalahari Craton. At 1.11 Ga, during the assembly of the supercontinent Rodinia, the Kalahari Craton was affected by the Umkondo-Borg Large Igneous Province. At 1.15–.98 Ga the Kalahari Craton collided with the eastern margin of Laurentia. Kalahari Craton The Kalahari Craton is a craton, an old and stable part of the continental lithosphere, that occupies large portions