Trung Trang Cave is located in the Trung Trang Valley on Cat Ba Island in Vietnam, near Cat Ba National Park and Lan Ha Bay. Visitors can explore the cave’s interior, walk through its passages, and take part in activities such as hiking, kayaking, and swimming in the surrounding area. The cave extends about 300 metres through a limestone mountain and features naturally formed stalactites, a diverse ecosystem, and historical significance as a former military site. It is also associated with local legends linked to the history of Cat Ba, reflecting both natural development over time and cultural heritage.