They vary in size, from very small to the huge one seen at Xiaozhai Tiankeng in China, known as the Xiaozhai Heavenly Pit. This sinkhole, thought to be the largest in the world, measures around ...
The Xiaozhai Tiankeng sinkhole is vast. Probably formed centuries ago by collapsing caves and underground rivers, teams of explorers have sought to understand its many mysteries for years.
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