The river region comprises the upper courses of the Brahmaputra (Yaru Tsangpo), the Salween (?
From Katmandu, the capital of Nepal, a difficult mountain route runs by Kirong to the No la (16,600 ft.), descending from which pass it strikes the Tsangpo about midway between Lhasa and Lake Manasarowar.
In the first, after an ineffectual attempt by Nepal, he travelled by the Manasarowar Lake, and the road thence eastward, parallel to the course of the Tsangpo, reaching Lhasa on the 10th of January 1866, and leaving it on the 21st of April 1867.
This watershed was found to lie much farther north than had been supposed, and to consist of very lofty mountains, in complicated ranges, from which large tributaries descend to the Tsangpo (Brahmaputra).
This Yarlung, which borrowed its name from the Yalung of the state of Fanni Tu-bat, is a river which flows into the Yaro-tsangpo (Brahmaputra).