Footprint Cave

　　Footprint Cave, shaped like a human footprint, is also known as a sinkhole, tiankeng (natural pit), or tianchuang (skylight). It is the only open skylight window between a sinkhole and an outflow cave. The opening has a diameter of about 100 meters at the top, approximately 20 meters at the bottom, and extends over 200 meters deep. Surrounded by steep cliffs, the site is both perilous and spectacular. The tiankeng is covered in a variety of tropical plants, and you can hear the thunderous roar of an underground river. Exploration has revealed that the underground river inside the tiankeng contains two large natural chambers, adorned with a multitude of hanging stalactites in strange and vivid shapes, creating a stunning landscape. More remarkably, these chambers are connected to two vertical shafts on the side of the tianchuang. Inside the caves, there are rare first-class protected animals such as the Chinese giant salamander and other transparent fish — a truly unique sight rarely seen in China.