Wednesday, April 6, 2011

Hang En Cave, Vietnam

Hang En Cave, Vietnam
Photograph by Carsten Peter, National Geographic

Going underground, expedition members enter Hang En, a cave tunneled out by the Rao Thuong River. Dwindling to a series of ponds during the dry months, the river can rise almost 300 feet (91 meters) during the flood season, covering the rocks where cavers stand.


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