横断山脈
The Yalong River (,  "Yǎlóngjiāng",  "Ya-lung Chiang",  ), or Nyag Chu (Tibetan: ,  "Nyag Qu"), is a major tributary river of the Yangtze River in Southwest China. With a length of , the Yalong River flows from north to south through the Hengduan Mountains in western Sichuan Province.