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Heaven Pit in Xiaozhai

 There is a large, mysterious heaven pit in the village of Xiaozhai, in Fengjie County. Geologically the hole is called a karst funnel, which is formed through the col­lapse of a water-eroded cave or results from erosion by surface water. According to one story, it was formed by the impact of a meteorite several hundred million years ago. The largest of its kind in the world, the funnel is 2,172 feet in diameter at the top, 1,713 feet in diam­eter at the bottom, and 2,185 feet deep. There is a clear underground river flowing through the bottom of the Xiaozhai heaven pit.