So why is Xiaozhai Tiankeng worth visiting ... zag staircase comprising of 2,800 steps to help you reach the bottom of the ...

Tiankeng must also have steep sides and rivers — or the ghosts of ancient rivers — flowing along the bottom, Xuewen said. At Xiaozhai Tiankeng, for example, the rainy season feeds an ...

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.