Muma River

The Muma River (Muma He 牧马河) is a right tributary of the Han River in the Yangtze river basin of northern China. It has a length of 128 km and a drainage area of 2782 km2. It originates in and flows entirely within Xixiang County of Shaanxi Province. The annual average flow is 45 m3/s. It has a natural drop of 1613 m and water reserves of 90,000 kilowatts. It arises near the border with Sichuan Province at 32.75639°N, 107.37083°W, flows northwest and debouches into the Han River at 33.09639°N, 107.9475°W.

The main branch of the Muma River is navigable by small boats as far south as the village of Matsung T'an.