Introduction to the Xiashiyuan Tiankeng: There are Zhongshiyuan Tiankeng and Xiashiyuan Tiankeng on the east side of Wulong Tiansheng Third Bridge. The two tiankeng are only 40 meters apart. The mouth of the Zhongshiyuan Tiankeng is perfectly round and shaped like Pear; The northwest side of the lower stone courtyard pit entrance is higher and the southeast side is lower with an obvious gap.