World deepest sinkhole - Xiaozhai Tiankeng

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World deepest sinkhole - Xiaozhai Tiankeng
The Xiaozhai Tiankeng, also known as the Heavenly Pit, is the world's deepest sinkhole. It is located in Fengjie County of Chongqing Municipality. The Xiaozhai Tiankeng is 626 metres long, 537 metres wide, and between 511 and 662 metres deep, with vertical walls. Its volume is 119,349,000 m³ and the area of its opening is 274,000 m². This material has been dissolved and carried away by the river. The sinkhole is a doubly nested structure—the upper bowl is 320 metres deep, the lower bowl is 342 metres deep, and the two bowls are on average 257 to 268 m across. Between both these steps is a sloping ledge, formed due to soil trapped in the limestone. In the rainy season, a waterfallcan be seen at the mouth of the sinkhole.
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