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 ...

China’s enormous sinkholes are drawing huge crowds of tourists, but experts caution that the influx of visitors poses a serious risk to the delicate ecosystems within these natural wonders.

Plants growing at the bottom of giant sinkholes in China are so awash in nutrients, they grow faster than their surface-dwelling counterparts, all while using less of a fundamental building block ...