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Situated south of Son Trach and accessible via the newly constructed Ho Chi Minh Highway we visited the area for the first time. We were based in the village of Truong Son on the banks of the River Dai Giang. We were made to feel very welcome by the local people of the ‘Vankieu’ tribe (King people). We concentrated our exploration in areas of Karst to the West of the village and accessible karst from the river and road.