Phong Nha-Ke Bang National Park

Designated a Unesco World Heritage Site in 2003, the remarkable Phong Nha-Ke Bang National Park contains the oldest karst mountains in Asia, formed approximately 400 million years ago. Riddled with hundreds of cave systems – many of extraordinary scale and length – and spectacular underground rivers, Phong Nha is a speleologists’ heaven on earth.
A caver stands under a beam of sunlight passing through a doline, into the world's biggest cave, Hang Son Doong.

©Mike Rowbottom/500px

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