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Vietnam’s Colossal Cave
Located in central Vietnam’s rugged Phong Nha-Ke Bang National Park, Hang Son Doong might be the world’s largest subterranean cavern. Expedition members enter through Hang En, a mile-long portal that tunnels into the lost world, hidden beneath a ring of mountains. The cave was carved out by the Rao Thuong River, which dwindles to a series of ponds during the dry months of April, May and October. At 2.5 miles long and 300ft wide, much of Hang Son Doong’s colossal caverns are still being explored. (Carsten Peter/National Geographic Stock)
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