Located at Xiaosai in Fengjie County, Wanzhou Municipality, the Heavenly Pit is remarked as the 'No.1 Pit in the World'. 

Being 666.2 meters deep and with its mouth as big as 622 meters in diameter, it has several underground streams. So, in terms of the pit's diameter and depth, it surpasses the 'funnel' in Arispo, United States, and the 'funnel' in Xinwen, Sichuan Province. Hence it is worthy of the title 'No.1 Pit in the World'. 

Situated nearby the Heavenly Pit, the Earthly Rift Valley, 10,000 meters long and 80-200 meters deep, has a number of caves under its bottom. Standing on the bottom, you would soon have a sense of mystery.