Af rican Sahara is the largest desert in the world, is located in the continent of sub-Saharan Africa. Politically, and consists of all the African countries that fully or partially located south of the Sahara (excluding Sudan). Contrasts with North Africa, which is part of the Arab world, Somalia, Djibouti and Comoros, Mauritania is geographically part of sub-Saharan Africa, but also part of the Arab world. Sahel is the transition zone between the Sahara and tropical savanna (Sudan region) and savanna mosaic of forests to the south. Since probably 5.9 kilo current year's event was separated Saharan regions and sub-Saharan Africa from extremely severe climatic conditions of the desert is sparsely populated, has been the formation of an effective barrier interrupted by only the Nile River in Sudan, despite the fact that the Nile blocked by cataracts eye of the river. Sahara pump theory explains how plant and animal life (including human so sapiens) left Africa to penetrat...