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Abay River (Blue Nile River)

Blue Nile

Blue Nile Falls (Tis Abay)

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The Blue Nile has a total length of 1,450 kilometers (900 mi), of which 800 km (500 mi) are inside Ethiopia. The Blue Nile flows generally south from Lake Tana and then west across Ethiopia and northwest into Sudan. Within 30 kilometers (19 mi) of its source at Lake Tana, the river enters a canyon about 400 kilometers (250 mi) long. This gorge is a tremendous obstacle for travel and communication from the north half of Ethiopia to the southern half. The power of the Blue Nile may best be appreciated at Tis Issat Falls, which are 45 meters (148 ft) high, located about 40 kilometers (25 mi) downstream of Lake Tana.

Blue Nile

Blue Nile Course

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The distance from its source to its confluence (confluence of Blue and White Nile near Khartoum) is variously reported as 1,460 and 1,600 kilometers (907 and 1,000 miles). The uncertainty over its length might partially result from the fact that it flows through a virtually impenetrable gorges cut in the Ethiopian Highlands to a depth of some 1,500 meters (4,900 ft)—a depth comparable to that of the Grand Canyon of the Colorado River in the United States.


The flow of the Blue Nile reaches maximum volume in the rainy season (from June to September), when it supplies about two thirds of the water of the Nile proper.



Reference: http://en.wikipedia.org/wiki/Blue_Nile

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