a river in Africa, rising in S central Burundi in its remotest headstream, the Luvironza: flows into Lake Victoria and leaves the lake as the Victoria Nile, flowing to Lake Albert, which is drained by the Albert Nile, becoming the White Nile at Lake No, then flowing through South Sudan; joined by its chief tributary, the Blue Nile (which rises near Lake Tana, Ethiopia) at Khartoum, and flows north to its delta on the Mediterranean; the longest river in the world. Length: (from the source of the Luvironza to the Mediterranean) 6741 km (4187 miles)

river in NE Africa, formed at Khartoum, Sudan, by the juncture of the Blue Nile, flowing from N Ethiopia, c. 1,000 mi (1,610 km) & the White Nile, flowing from Lake Victoria, c. 1,650 mi (2,655 km), & flowing north through Egypt into the Mediterranean: with the White Nile & a headstream south of Lake Victoria, c. 4,160 mi (6,695 km)