(from the article `Nile River`) ...rainfall on the East African Plateau of the previous summer. The second source is the drainage of southwestern Ethiopia through the Sobat ... ...the Bar al-Jabal (`Mountain Nile`) above Malakl, The Sudan, to form the White Nile. The Sobat is formed by the confluence of its two main ... [2 ... Found on http://www.britannica.com/eb/a-z/p/64