Sinkholes are depressions or holes in the ground caused by the collapse of a surface layer, often occurring in areas known as karst landscapes. These landscapes are characterized by soluble rock ...

It contains the most significant types of karst landforms, including tower karst ... Wulong Karst has been inscribed for its giant dolines (sinkholes), natural bridges and caves. Description is ...

The South China Karst region is geologically so unique that it has been named a UNESCO World Heritage Site. It is filled with sinkholes that contain their own forests, rivers, and ecosystems ...