The Brahmaputra Valley has an average width of about 80 Km.
The main river of the valley, Brahmaputra is one of the largest rivers in the world and rank fifth with respect to its average discharge.
The river originates from the Kailash ranges of Himalayas at an elevation of 5300 M.
After flowing through Tibet it enters India through Arunachal Pradesh and flows through Assam and Bangladesh before it joins Bay of Bengal.
Brahmaputra sub-basin extends over an area of 580,000 sq.km lying in Tibet (China), Bhutan, India and Bangladesh.
The drainage area lying in India is 194413 sq.km which is nearly 5.9% of the total geographical area of the country
It is bounded on the north by the Himalayas, on the east by the Patkari range of hills running along the Assam-Burma border, on the south by the Assam range of hills and on the west by the Himalayas and the ridge separating it from Ganga sub-basin.
The sub-basin lies in the States of Arunachal Pradesh, Assam, Nagaland, Meghalaya, West Bengal and Sikkim.
Brahmaputra & Its Tributaries