 The Dangqu River (, p "Dāngqū") is the actual geographic headwater of the Yangtze.The name is derived the Classical Tibetan for "Marsh River" (, w "'Dam Chu").The Chumar River (楚玛尔河) is the Chinese name for the northern headwater of the Yangtze, which flows from the Hoh Xil Mountains in Qinghai into the Tongtian.