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Xiaozhai Tiankeng - Wikipedia
China's huge and mysterious Xiaozhai Tiankeng sinkhole - BBC
A giant sinkhole in China has an ancient forest growing inside - NPR
Xiaoxhai Tiankeng: the world's biggest sinkhole - BBC
China's 'heavenly pits': The giant sinkholes that have ancient …
Descending Into the Lush Underworld of China’s Newly Discovered Sinkhole
Ancient Forest Discovered in Chinese Sinkhole | Smithsonian
Giant sinkhole with a forest inside found in China
China sinkhole found with ancient forest, tall plants at the bottom
Scientists discover an ancient forest inside a giant sinkhole in China