Brahmaputra (i. e. son of Brahma), a river which rises in Tibet, circles round the E. of the Himalayas, and, after a course of some 1800 m., joins the Ganges, called the Sampo in Tibet, the Dihong in Assam, and the Brahmaputra in British India; it has numerous tributaries, brings down twice as much mud as the Ganges, and in the lower part of its course overflows the land, particularly Assam, like an inland sea.