blue nile

noun

1. a river in E Africa, flowing NNW from Lake Tana in Ethiopia into the Nile at Khartoum: a tributary of the Nile. About 950 miles (1530 km) long.

noun

1. a river in E Africa, rising in central Ethiopia as the Abbai and flowing southeast, then northwest to join the White Nile. Length: about 1530 km (950 miles)