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Giant sinkholes known as tiankeng, or “heavenly pits”, were discovered in southern China. Rare plants and fossils of ancient marine animals have been found in these karst sinkholes. | South China Morning Post
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Two giant karst sinkholes and over a dozen small limestone caves have been discovered in Donglan County, S China's Guangxi. One sinkhole measuring over 300m in-depth, 250m in width and 120m in length at the bottom, is one of the world's 50 largest karst sinkholes. #AmazingChina | China News 中国新闻网 | Facebook
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