Trinh Nu Cave

Trinh Nu Cave, also known as Virgin Cave, is a natural limestone cave on Bo Hon Island in Ha Long Bay, Ha Long City, Quang Ninh Province, Vietnam. Part of the UNESCO World Heritage-listed Ha Long Bay, it is famous for its stalactite and stalagmite formations and a central stone statue resembling a reclining virgin. The cave is linked by local legend to Trong Cave opposite and is accessible only by boat as part of bay cruise routes.

Visitors reach Trinh Nu Cave by sightseeing boat or overnight cruise from Tuan Chau Marina or Bai Chay Wharf. Access involves disembarking at Bo Hon Island and climbing steps to the cave entrance. Inside, visitors can explore a spacious chamber with stalactites and stalagmites, a central rock formation resembling a reclining girl, and illuminated pathways. The cave overlooks a small sandy beach and emerald bay waters, with views of Trong Cave on the opposite islet.

Archaeological excavations in Trinh Nu Cave have revealed traces of the prehistoric Ha Long culture, including pottery and stone tools indicating ancient fishing communities. The cave is also central to a well-known local legend about a faithful young woman who died in the cave waiting for her lover, whose counterpart is said to be in nearby Trong Cave.

The cave is culturally significant for its romantic legend symbolizing fidelity and love, which is widely told to visitors as part of Ha Long Bay folklore. The paired story of Trinh Nu Cave (Virgin Cave) and Trong Cave (Male Cave) represents enduring love and is an important element of local oral tradition and tourism interpretation.