Scientists from China and France have discovered a rare doline in south China’s Guangxi Zhuang Autonomous Region, the local publicity department said.

The 420-meter deep doline, or sink hole, was among a number discovered by scientists during an eight-day expedition that began on February 26 in Donglan County. The dolines found in Guangxi are normally around 250 meters deep.

The scientist team has also discovered many species living in these dolines, while scientists also found found some as-yet unidentified vertebrates and plants.

Dolines are special geological landscape formations found in karst regions, formed by repeated cave-ins of underground caves. They are common in China, Mexico and Papua New Guinea.

Source: china.org.cn