Blue Nile (Arabic Al Baḩr al Azraq), river in northeastern Africa, 1,370 km (850 mi) long. It rises at an altitude of 1,830 m (6,000 ft) in the region of Lake T’ana, in northwestern Ethiopia, flows south and then west in Ethiopia, and follows a northwestern course in Sudan before merging, at Khartoum, with the White Nile to form the Nile proper. The Blue Nile, which contributes about two-thirds of the water of the Nile, is known as the Abbai in Ethiopia, where it, in part, flows through a deep gorge. The river is dammed for irrigation and hydroelectricity production in Sudan.
The Blue Nile is vital for Sudan. Blue Nile produce 80% of Roseires and Sennar dam and produce the country's power. These dams also help irrigation, Gezira Plain, which is most famouse for good quality cottons. Also it produce wheat and animal feed crops
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