The Nile rapids
Below the mouth of the last large tributary (Atbar), about 300 km from Khartoum, the Nuba desert begins.
Here, Neil makes a large bend, cutting through a plateau, built up by solid sandstones and crosses a series of rapids (cataracts).
In total there are 6 rapids between Khartoum and Aswan. The first of them, closest to the mouth, is in the area of Aswan, north of the Aswan Dam. The dam of the Aswan reservoir
Up to the 60s of the XX century (that is, before the erection of the Aswan High Dam in 270 km from the Sudanese-Egyptian border in Egypt) the rapids represented a serious obstacle to continuous navigation. In the area of rapids, year-round navigation was possible only on boats.
For permanent navigation, the sections between Khartoum and Juba, Aswan and Cairo, Cairo and the mouth of the Nile were used.
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