Ban Gioc Detian Falls are 2 waterfalls on the Quay Son River or Guichun River straddling the Sino-Vietnamese border, located in the Karst hills of Daxin County in the Chongzuo prefecture-level city of Guangxi Province, on the Chinese side, and in the district of Trung Khanh District, Cao Bang province on the Vietnamese side, 272 km north of Hanoi. Guangxi, formerly romanized Kwangsi, is a province of southern China along its border with Vietnam. In 1958, it became the Guangxi Zhuang Autonomous Region of the People's Republic of China, a region with special privileges created specifically for the Zhuang people.