Detian – Banyue Falls or Ban Gioc Falls, are 2 waterfalls on the Quy Xuan River straddling the Sino-Vietnamese border, located in the Karst hills of Daxing County in the Chongzuo prefecture of Guangxi Province, on the Chinese side, and in the district of Trung Khanh, Cao Bằng province on the Vietnamese side, 272 km north of Hanoi. The waterfall falls thirty meters. It is separated into three falls by rocks and trees, and the thundering effect of the water hitting the cliffs can be heard from afar.