Coc Vai Stone Pillar

Coc Vai Stone Pillar is a natural limestone pillar rising vertically from the waters of the Na Hang - Lam Binh reservoir in Thuong Lam Commune, Lam Binh District, Tuyen Quang Province. Located within the Na Hang - Lam Binh scenic area, the isolated karst pillar is surrounded by forested limestone mountains and calm lake waters. It is a distinctive natural landmark and a well-known stop on boat tours of the reservoir.

Visitors can expect to view a tall, slender limestone pillar standing alone in the reservoir, accessed only by boat as part of a Na Hang - Lam Binh Lake tour. The setting includes expansive lake waters, surrounding karst peaks and forested hills. There is no access onto the pillar itself; viewing and photography are from the boat on the water. The area is natural and undeveloped with no built structures on the pillar.

The pillar is associated with local Tay ethnic folklore and is regarded as a natural landmark within the cultural landscape of Lam Binh. It features in local boat tour narratives and is valued as a symbol of the Na Hang - Lam Binh lake region.