We’ve already explored a newly discovered giant sinkhole in China housing a primeval ‘lost world,’ but Xiaozhai Tiankeng takes the concept to an entirely new level. Imagine a sinkhole so immense and deep that hiking from the rim to the bottom—and back—can take half a day or more.
Welcome to Xiaozhai Tiankeng, also known as the Heavenly Pit—the world’s deepest sinkhole. Nestled in Fengjie County, China, this geological wonder plunges a staggering 2,172 feet (662 meters) straight into the earth.
For centuries, Xiaozhai Tiankeng remained hidden from the wider world. While local communities were aware of its existence, it wasn’t until 1994 that a team of British explorers brought this colossal pit into international spotlight.
Carved over millions of years by powerful underground rivers slowly dissolving limestone, the sinkhole’s sheer vertical walls and immense depth leave visitors breathless—a true natural marvel sculpted by time.
Xiaozhai Tiankeng is far more than just a massive hole in the earth—it’s a world of its own. Its unique microclimate, complete with distinct weather patterns and lush vegetation, has created a thriving ecosystem unlike anywhere else.
Researchers have identified 1,285 plant species, including ancient ginkgo trees, as well as rare animals such as the elusive clouded leopard and the impressive Chinese Giant Salamander. Many of these species remain undocumented outside the sinkhole, hinting at exciting new scientific discoveries waiting to be made.
Exploring this giant natural wonder demands careful preparation and solid physical fitness. The descent can take up to 4 hours, as hikers navigate steep and uneven terrain. The climb back up is just as challenging, requiring proper gear and support. Luckily, a 2,800-step staircase has been built to ease the journey for those daring enough to take on the Heavenly Pit.
The scale of Xiaozhai Tiankeng is truly mind-boggling. Imagine the Empire State Building — that towering giant — being swallowed whole by this enormous sinkhole, with room to spare! Beneath its massive walls, an underground river continues to flow, carving and shaping the pit as it has for millennia.
Inside this natural marvel, a unique microclimate thrives, complete with its own weather system and temperatures often cooler than the surrounding landscape.
Curious what it feels like to stand at the bottom of the world’s deepest sinkhole? Dive into the wonders of Xiaozhai Tiankeng with this captivating BBC Reel video that takes you on an unforgettable journey inside the Heavenly Pit.
