noun, Pathology. 1. the accumulation of excessive ketones in the body, as in diabetic acidosis. Origin of ketosis. 1915-1920.
Climate zones of Africa, showing the ecological break between the hot desert climate of the Sahara Desert (red), the hot semi-arid climate of the Sahel (orange) and the tropical climate of Central and Western Africa (blue).
The Sahel is the transitional zone between the Sahara and the tropical savanna (the Sudan sÃ»dÃ¢n) region and-forest savanna mosaic to the. South The horn Of africa And Southern sudan are geographically part of-Sub Saharan, africa but nevertheless show Strong Middle eastern influence and are also part of The arab. worldince around 5,400 years ago, 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 River in Sudan, though the Nile was blocked by the river's cataracts.