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The Brahmaputra Valley is one of the largest rivers in the world, with an average width of about 80 kilometers. The main river of the valley, Brahmaputra, is rank fifth with respect to its average discharge. The river originates from the Kailash ranges of Himalayas at an elevation of 5300 meters. After flowing through Tibet it enters India through Arunachal Pradesh and flows through Assam and Bangladesh before joining the Bay of Bengal.

 

The catchments area of the Brahmaputra River in Tibet is 293,000 square kilometers; in India and Bhutan, it's 240,000 square kilometers; and in Bangladesh, it's 47,000 square kilometers. The Brahmaputra basin extends over an area of 580,000 square kilometers up to its confluence with the Ganges within Bangladesh. The average width of the Brahmaputra is 5.46 kilometers. The maximum discharge of the Brahmaputra at Pandu near Guwahati was recorded as 72,779 cubic meters per second on August 23, 1962. The minimum discharge was recorded as 1,757 cubic meters per second on February 22, 1963. The average annual discharge is about 20,000 cubic meters per second, and the average dry season discharge is 4,420 cubic meters per second.