Description : The distant hills in the background are the foothills of the Himalayas. As the river flows through Arunachal Pradesh, the banks become fertile and are extensively cultivated. India. Brahmaputra the major river of Central and South Asia, flows some 1,800 miles, 2,900 kilometers, from its source in the Himalayas to its confluence with the Ganges River, after which the mingled waters of the two rivers empty into the Bay of Bengal. Along its course it passes through the Tibet - Autonomous Region of China, the Indian states of Arun?chal Pradesh and Assam, and Bangladesh. For most of its length, the river serves as an important inland waterway; it is not, however, navigable between the mountains of Tibet and the plains of India. In its lower course, the river is both a creator and a destroyer. Depositing huge quantities of fertile alluvial soil but also causing disastrous and frequent floods.