Ban Gioc Waterfall - Detian Waterfall - Ban Gioc Waterfall Is One Of Vietnam’s Most Impressive Natural Sights. Located In The Northeastern Province Of Cao Bang, The Falls Are 30 Metres High And 300 Metres Across, Making Ban Gioc The Widest – But Not The Highest – Waterfall In The Country. The Falls Occur On The Quay Son River, A Beautiful Jade-blue Body Of Water, Flowing Through A Pastoral Landscape Of Rice Fields And Bamboo Groves, Surrounded By Limestone Pinnacles. Photo