Hunter-gatherer peoples of the Kalahari and southern African interior (San/Bushmen, including the !Kung, Ju/'hoansi and related groups), among the oldest continuously-documented lineages in southern Africa, progressively displaced into marginal arid lands by Bantu-speaking farmers and later European colonization.
Not an ending: San communities endure across Botswana, Namibia and South Africa (incl. recognized lands such as Nyae Nyae). The map hands off to the modern states.
Alan Barnard's accessible Cambridge survey of the San from deep prehistory through the classic hunter-gatherer ethnographies to their present-day descendants.