Introduction to Xiaozhai Tiankeng: Xiaozhai Tiankeng is located in Xiaozhai Village, Fengjie County, Chongqing. It is a karst funnel landform with a double-layer structure. The ground elevation of the pit entrance is 1331 meters, the depth is 666.2 meters, the diameter of the pit entrance is 622 meters, and the diameter of the pit bottom is 522 meters. , is the largest "funnel" discovered in the world so far. It is famous for its thrills and wonders, and is rated as "the best pit in the world" by cave research experts.