The Nile Basin covers an area of about 3,176,541 km2 in eleven countries. The Nile Basin Comprises two broad sub systems. These are the Eastern Nile sub system and the Equatorial Nile sub system. The basin is further divided into ten Major sub-basins. The Eastern Nile sub sytem comprises the Main Nile Sub-basin, Tekeze-Atbara Sub-basin, Blue Nile Sub-basin and the Baro- Akobo-Sobat Sub-basin. The Equatorial Nile sub system comprises of Lake Victoria sub-basin, Albert Nile Sub-basin, Victoria Nile Sub-basin, Bahr el Jebel Sub-basin, White Nile Sub-basin and Bahr el Ghazal Sub-basin.

Sub-basin | Area (Km2) |
Lake Victoria | 241893 |
Lake Albert | 96807 |
Victoria Nile | 85521 |
Bahr el Jebel | 185364 |
Bahr el Ghazal | 604746 |
Baro-Akobo-Sobat | 204288 |
White Nile | 258803 |
Blue Nile | 304656 |
Tekeze-Atbara | 232374 |
Main Nile | 958872 |
