The Wu River (Chinese: 㵲水or潕水; pinyin: Wǔ Shuǐ) is a left tributary of the Yuan River in south China. This upper stream is called Wuyang River (Chinese: 㵲阳河; pinyin: Wǔyáng Hé) in Guizhou Province; it rises on the western slopes of Mount Foding in the southeast of Weng'an County. The river runs eastward into Hunan Province and then is called the Wu River. It joins Yuan River at Hongjiang City. The river has a length of 444 kilometres (276 mi) and drains an area of 10,334 square kilometres (3,990 sq mi).