According to many scholars, Africa, where todayis the largest and enigmatic desert of the planet, is the birthplace of human civilization. It is also believed that it was desertification of territories that forced people to leave their habitable places and adapt to new living conditions. This to a certain extent contributed to the evolution of man.
According to some paleontologists,the territory where today the Sahara desert stretched, there was once a completely different climate. It favored the wide dissemination of diverse species of plants and animals. A variety of lush vegetation gave shelter and food to animals and humans, so the region was heavily populated by people.
The length of the Sahara desert from north to south and fromwest to eastern borders is so great that it occupies about 30% of the whole area of Africa or a third of its northern part. Sahara stretches from the coast of the Atlantic Ocean to the shores of the Red Sea. These geographical objects are the natural boundaries of the desert in the west and east. The distance from the western to the eastern borders is about 4,800 kilometers. The length of the Sahara in the north to the south varies from 800 to 1200 km in different places. In the north, the desert reaches the Atlas Mountains and the Mediterranean Sea. In the south, the Sahara borders on the ancient inactive impassable dunes of the Libyan Desert.
On the boundless expanses of the Sahara, strong winds prevail, which can move huge masses of sand from place to place. It is for this reason that the territory is constantly changing its appearance.
For the reason that the length of the Sahara desertfrom the south to the north is so huge, a single detailed classification of landscapes, constantly replacing each other, has not been developed. In the educational and scientific literature there are only basic names, although in reality there are more.
The length of the Sahara desert from north to southfrom year increases. This is due to the fact that droughts in the areas adjacent to the desert territory are repeated with a certain regularity. Scientists-environmentalists explain this process in different ways, but the person who recognized the origin of desertification of new regions of Africa is still recognized. Unreasonable use of natural resources always leads to problems of this kind.
Extreme natural conditions existing in thethe entire territory of the desert, make a person's living here almost impossible. However, in spite of this, even the most arid regions of the Sahara are inhabited by the nomadic tribes of Ted and Tuareg. But still it must be said that some areas of this harsh land are completely deserted.
The bulk of the population lived in the desertTerritories located along the coast of the Nile - the only river flowing through the Sahara. Rusla of other rivers are filled with life-giving moisture only in a short rainy period. Then they dry up and remind themselves of only the depressions left on the surface.