A team of multinational scientists have discovered a giant cluster of karst sinkholes in Guangxi Zhuang Autonomous Region.
The sinkhole cluster, which consists of 19 karst sinkholes, is mainly located in Napo County.
The sinkholes are interconnected through an underground river and a cave system, making them the largest cluster ever found south of the Tropic of Cancer.
Most of the sinkholes boast a volume of over 1 million cubic meters, and their original vegetation is largely intact and the trace of human activities is scant.
