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From its origin in southwestern Tibet as the Yarlung (Imperial blood) River, it flows across southern Tibet where it is known as Dihang to break through the Himalayas in great gorges. It flows southwest through the Assam Valley and south through Bangladesh as the Jamuna. There it merges with the Ganga to form a vast delta. About 1,800 mi (2,900 km) long, the river is an important source for irrigation and transportation. Its upper course was long unknown, and its identity with the Zangbo was only established by exploration in 1884-86.

While most Indian and Bangladeshi rivers bear female names, this river has a rare male name, as it means “son of Brahma” in Sanskrit.

The Brahmaputra is navigable for most of its length. The lower reaches are sacred to Hindus. The river is prone to catastrophic flooding in spring when the Himalayan snows melt. It is also one of the few rivers in the world that exhibit a tidal bore.

http://en.wikipedia.org/wiki/Brahmaputra_River