The Muma River (Muma He 牧马河, literally, Herd Horse River) is a right tributary of the
Han River in the
Yangtze river basin of northern China. It has a length of and a drainage area of . It originates in and flows entirely within
Xixiang County
Xixiang County () is a CPRC, county under the administration of Hanzhong City, in Shaannan, the southwest of Shaanxi province, China, bordering Sichuan province to the southwest. Its administrative center, Xixiang, formerly known as Hsihsiang, li ...
of
Shaanxi Province
Shaanxi is a province in north Northwestern China. It borders the province-level divisions of Inner Mongolia to the north; Shanxi and Henan to the east; Hubei, Chongqing, and Sichuan to the south; and Gansu and Ningxia to the west. Shaanxi ...
. The annual average flow is . It has a natural drop of and water reserves of 90,000 kilowatts.
It arises near the border with
Sichuan Province
Sichuan is a Provinces of China, province in Southwestern China, occupying the Sichuan Basin and Tibetan Plateau—between the Jinsha River to the west, the Daba Mountains to the north, and the Yunnan–Guizhou Plateau to the south. Its capita ...
at , flows northwest and debouches into the Han River at .
The main branch of the Muma River is navigable by small boats as far south as the village of Matsung T'an.
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{{China Rivers
Rivers of Shaanxi
Tributaries of the Yangtze River