Introduction to Wanhua Rock: Wanhua Rock is the main cave of the cave system, 2,550 meters long, and the developed tourist section is 2,200 meters long. On the plane, the dry cave and the underground river basically overlap, and part of the underground river has been opened up for rafting in the cave. section, the rafting length is 1850 meters. The main cave has three entrances: north, middle and south. The north entrance is the entrance to the tour, and the middle entrance is the black rock tiankeng, which is the exit of the tour section. The main cave passages to visit are canyon-style and hall-style cave passages. There is also a cave sanatorium for patients with respiratory diseases.