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Shandong Cave, Vietnam 🇻🇳
It is located in Central Vietnam, Quang Bin Province, in the Phongya Kebang National Park, 500 km south of Hanoi. The cave has been known to the local population since 1991, and in April 2009 it was discovered by a British group. There is an underground river in the cave, and some parts of the cave are flooded during the rains. Fast underground rivers flow inside it, trees grow up to 3 meters high, and real clouds appear under the cave due to high temperature changes.