Phong Nha - Ke Bang is a national park and UNESCO World Heritage Site in the Bố Trạch and Minh Hóa districts of central Quang Binh Province, in north-central Vietnam, about 500 km south of the nation's capital, Hanoi. Phong Nha-Ke Bang area is noted for its cave and grotto systems as it is composed of 300 caves and grottos with a total length of about 70 km, of which only 20 have been surveyed by Vietnamese and British scientists. Vietnam
