The upstream inflow entrance of Tham Khoun Xe has a verdant forest inside a huge collapsed doline. It is possible to kayak from the resurgence to here and back in one full day. There are several more kilometers of cave in an adjacent fossil passage that visitors can access by climbing the boulder pile. on March 2015 at Tham Khoun Ex, Laos. (Photo by John Spies/Barcroft Media/ABACAPress)
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