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E-mail ECNS, May 21, 2019
An aerial photo shows a waterfall in Didonghe Tiankeng, a giant karst sinkhole at Huoshizi Village of Ningqiang County in Hanzhong, northwest China's Shaanxi Province. With a maximum depth of 340 meters, the Didonghe Tiankeng is the largest in Chanjiayan Tiankeng Group in Ningqiang County. (Photo/Xinhua)
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