 From the Dadu River's true source in Qinghai to the Min River's confluence with the Yangtze in Yibin, the length of the entire Min-Dadu River system is .The Dokog River in the west and the Markog River in the east both flow southeasterly from the Bayan Har Mountains in Qinghai and into Sichuan Province.The two stems meet in Aba Prefecture, and continue south as the Dajin Chuan ().