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This Sinkhole In China : r/Damnthatsinteresting
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China's huge and mysterious Xiaozhai Tiankeng sinkhole
Huge ancient forest world discovered 630 feet down sinkhole in China
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Chinese Scientists Discover A New 630-Feet-Deep Sinkhole With A Forest At The Bottom
Xiaozhai Tiankeng - Wikipedia
Giant sinkhole with a forest inside found in China | Live Science
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China scientists find massive 630ft-deep sinkhole with an entire hidden forest inside in Guangxi | The Independent
World's Largest Cluster of Sinkholes Discovered
Giant sinkhole with ancient, underground forest discovered in China
This is a huge ancient forest world discovered 300 meters down a sinkhole in Hubei, China, containing a unique ecosystem of ancient trees, plants and animals (more information in the comments) :