Paths follow the the Ngoc Tuyen River through this beautiful cave for about 1km. The entrance has a series of poems carved in Chinese characters by the cave’s 18th-century discoverer, a soldier called Ngo Thi San. There’s also an intriguing carved stone plaque commemorating an early French resident of Lang Son. It's a five-minute drive south of Tam Thanh Cave.
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Must-see attractions
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