A Per­fectly Round

China Scenic - - Special Report -

Tianx­uan Tiankeng in Zhenba County, Hanzhong, has a nearly per­fectly round open­ing. Its width reaches 110 me­ters and depth 150 me­ters. The tiankeng’s west wall is well pre­served, al­most ver­ti­cal, while the east col­lapsed and was cov­ered by Qu­a­ter­nary over­lay. The col­lapsed rocks and earth formed a small mound at the tiankeng’s bot­tom and was cov­ered by sparse shrubs, grass and moss.

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