Big Enough to Swallow Cities and Hide Skyscrapers — A ‘Lost World’ Lies Within

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The world’s deepest known tiankeng combines immense scale, active geology, flowing water and rich biodiversity below Chongqing’s rim.

It Is the World’s Deepest Known Tiankeng

Its Deepest Drop Reaches About 662 Metres

Its Volume Explains the City-Scale Language

The Chasm Has Two Separate Bowls

Water Built the Void From Below

The Underground River Is Still Flowing

A Forest Developed Below the Rim

Rare Animals Have Been Reported Inside

Tiankeng Plants Use Unusual Strategies

The “Lost World” Is Accessible but Demanding

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In the mountains of Chongqing, China, Xiaozhai Tiankeng opens into a limestone void so deep that many famous skyscrapers could stand inside it. Its sheer scale has encouraged city-swallowing comparisons, although those descriptions are dramatic metaphors rather than literal measurements.

Far below the rim, forest, water and wildlife occupy a cooler, wetter environment partly separated from the surrounding landscape. The “lost world” is a genuine ecosystem, but it is neither completely sealed off nor untouched by people.

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