The Yuan or Yüan River (Chinese: 沅江, p Yuán Jiāng or 沅水, Yuán Shuǐ) is one of the four largest rivers in Hunan province in southeast-central China. It is a tributary of Yangtze River. It is 864 kilometres (537 mi) long and rises in Guizhou province in the Miao Mountains near Tu-yün and is navigable. The upper stream is called the Lung-t'ou River, and downstream it is called the Qingshui ("Ch'ing-shui") River.