![Phong Nha Cave - Photo by [Tycho]](/_next/image?url=https%3A%2F%2Ffirebasestorage.googleapis.com%2Fv0%2Fb%2Fcape-split-prod.appspot.com%2Fo%2Flocation-photos%252F1645be57222605dd192be4ac5df9d1d8b925b25e_t.jpg%3Falt%3Dmedia&w=3840&q=85)
Phong Nha Cave is a cave in Phong Nha-Kẻ Bàng National Park which is a UNESCO World Heritage Site. It is 7,729 metres long and contains 14 grottoes, as well as a 13,969 metre underground river. While scientists have surveyed 44.5 kilometres of passages, tourists are only allowed to explore the first 1500 metres.
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