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Phong Nha - Ke Bang National Park is a UNESCO World Heritage Site, located in the Bo Trach and Minh Hoa Districts of central Quang Binh Province, in north- central Viet Nam. Phong Nha - Ke Bang is famous for its cave systems. It has 300 caves with a total length of about 70 km, of which only 20 have been surveyed by Vietnamese and British scientists. The park contains many fascinating rock formations and Ke Bang Forest. Travelers should take a boat ride through underground rivers to experience nature and enjoy fresh air.