Phong Nha – Ke Bang is a national park in north-central Vietnam, about 500 km south of the nation’s capital, Hanoi. The park was created to protect one of the world’s two largest karst regions (landscapes shaped by the dissolution of a layer soluble bedrock) with 300 caves and grottoes and also protects the ecosystem of limestone forest of the Annamite Range region in north central coast of Vietnam.
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 126 km, of which only 20 have been surveyed by Vietnamese and British scientists; 17 of these are in located in the Phong Nha area and three in the Ke Bang area. Before discovery of the nearby, Son Doong Cave in 2009, Phong Nha was the largest cave in the world.



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