Ban Doc waterfall is a collective name for two waterfalls on the Quây Sơn River (Chinese: Guichun River), that straddle the international border between China and Vietnam, more specifically located between the Karst hills of Daxin County, Guangxi and Trùng Khánh District, Cao Bằng Province. The waterfall is 272 km (169 mi) north of Hanoi.