Ban Gioc – Detian Falls or Ban Gioc Ducthien falls (Vietnamese: thác Bản Giốc, Đức Thiên-Bản Ước Chinese: Détiān pùbù, Bǎnyuē pùbù 板約瀑布, 德天瀑布) is a collective name for two waterfalls on the Quây Sơn River (Chinese: Guichun River (Vietnamese: Quy Xuân Hà), 归春河), that straddle the international border between China and Vietnam; more specifically located between the Karst hills of Daxin County, Guangxi, (Vietnamese: Đại Tân, Quảng Tây) and Trùng Khánh District, Cao Bằng Province. (Chinese Chongqing,Gaoping 重庆,高平) The waterfall is 272 km (169 mi) north of Hanoi (河內 Henei).