Located in fengjie county, chongqing, xiaozhai tiankeng is an important example of the quaternary evolution of the earth, and also a "living fossil" of the formation of the three gorges of the Yangtze river, which is commonly known as the karst funnel.It is one of the wonders of caves in the world today.Xiaozhai tiankeng, the largest "tiankeng" (sky hole)in the world, is located in xiaozhai village, jingzhu township, 91 kilometers away from fengjie county.It is about 30°44'23" north latitude and 109°29' east longitude.