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Lighter green: However, Sudan is classified as North Africa by the United Nations Statistics Division.Simplified climatic map of Africa: Sub-Saharan Africa consists of the Sahel and the Horn of Africa in the north (yellow), the tropical savannas (light green) and the tropical rainforests (dark green) of Equatorial Africa, and the arid Kalahari Basin (yellow) and the "Mediterranean" south coast (olive) of Southern Africa.
the Saharan and Sub-Saharan regions of Africa have been separated by the extremely harsh climate of the sparsely populated Sahara, forming an effective barrier interrupted by only the Nile in Sudan, though the Nile was blocked by the river's cataracts.
According to paleontology, early hominid skull anatomy was similar to that of their close cousins, the great African forest apes, gorilla and chimpanzee, but they had adopted a bipedal locomotion and freed hands, giving them a crucial advantage enabling them to live in both forested areas and on the open savanna at a time when Africa was drying up, with savanna encroaching on forested areas. By 3 million years ago several australopithecine hominid species had developed throughout southern, eastern and central Africa.
They were tool users rather than tool manufacturers.
This dispersal of the human species is suggested by linguistic, cultural and genetic evidence.
After the Sahara became a desert, it did not present a totally impenetrable barrier for travelers between north and south because of the application of animal husbandry towards carrying water, food, and supplies across the desert.