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. i was lucky enough to join a 6 day expedition into the cave in April this year.
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