Xiaozhai Tiankeng (GPS: 30.75055, 109.47; 小寨天坑) is the world's deepest sinkhole. It is located in Fengjie County, in Chongqing Municipality of China. The sinkhole measures 626 meters (2054 feet) long, 537 meters (1762 feet) wide and between 511 and 662 meters (1677 and 2172 feet) deep. The name Xiaozhai Tiankeng literally translates as "little village heavenly pit". It was formed by an underground river which is still flowing underneath the sinkhole. The underground river starts in the Tianjing fissure gorge. It reaches a vertical cliff and becomes a 46-meter (151-foot) waterfall that empties into the Migong River.