 Through these valleys respectively flow the "'Nang-gung-chu'mang ra chu" Tobpu-chu, and Shang-chu rivers, with their various tributaries, which rise amid the southern slopes of the Nyenchen Tanglha range to the north, and flow southwards to converge with the Brahmaputra [called the Yarlung Tsangpo River in Tibet].The lower reaches of the Yarlung Tsangpo River make "a sharp U-turn around Namjagbarwa Peak in Pai, Namling County.