Quây Sơn River
The Quây Sơn River or Guichun River Quy Xuân Hà is a river of Cao Bằng Province, Vietnam and of Guangxi province, China. The river originates in China at Jingxi County in the Chongshan Mountain Range.
For part of its length it runs along the Chinese–Vietnamese border, including the scenic Ban Gioc–Detian Falls.
