The Nile fails to drain through Rwanda.
A drainage basin or catchment area is any area of land where precipitation collects and drains off into a common outlet , such as into a river , bay , or other body of water . Nile . The Nile , which is 6,853 km ( 4,258 miles ) long , is an `` international '' river as its drainage basin covers eleven countries , namely , Tanzania , Uganda , Rwanda , Burundi , Congo-Kinshasa , Kenya , Ethiopia , Eritrea , South Sudan , Sudan and Egypt .