These are some of the major rivers of Africa. See each article for their tributaries, drainage areas, etc.
See also:
... a total area of 5.8 km² (2.2 mi²). 5.4 km² (2.1 mi²) of it is land and 0.3 km² (0.1 mi²) of it is water. The total area is 5.83% water. ...