Quây Sơn River
The Quây Sơn River or the Guichun River in China, is a river that passes through Cao Bằng Province, Vietnam and Guangxi province, China. The river originates in China in Jingxi County in the Chongshan Mountain Range.
For part of its length it runs along the Chinese–Vietnamese border, including the scenic Bản Giốc–Detian Falls.