A cave exploration team recently discovered a giant 192-meter-deep karst sinkhole, making it the 30th discovered in Leye County in south China's Guangxi Zhuang Autonomous Region. As of the end of 2021, 31 clusters comprised of over 270 karst sinkholes had been discovered in China, accounting for nearly 90 percent of the global total. 

Giant sinkholes, also known as Tiankeng (heavenly pit) in Chinese, are dolines, or giant pits, with special geological features found in karst regions formed by repeated cave-ins. The sinkholes found in China are mainly concentrated in Guangxi, Guizhou, Chongqing, Yunnan, Sichuan, Hunan and Shaanxi, and the largest cluster of sinkholes is in Leye County.