Hang Son Doong Cave, Vietnam
Photograph by Ryan Deboodt, National Geographic Your Shot
After two days of trekking, a group of cavers rests at the first camp inside Hang Son Doong in central Vietnam. Hidden in rugged Phong Nha-Ke Bang National Park near the border with Laos, the 2.5-mile cave is part of a network of 150 or so caves, many still not surveyed, in the Annamite Mountains.
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