Where does the water of Jiudun skylight come from?

Chengjiang. According to the inquiry of official website, the People's Government of Guangxi, the Jiudun skylight in Guangxi was formed in the carbonate strata of Maokou Formation and Qixia Formation of the Lower Permian, and was formed after the sinkhole collapsed. The source of skylight comes from the mother river Chengjiang. Jiudun Tianguang Scenic Area, located in the upper reaches of Chengjiang River Basin in Jiudun Village, Daxing Township, Du 'an County, Guangxi Zhuang Autonomous Region, is an integral part of Chengjiang National Wetland Park.