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Scientists have found the world's largest cluster of sinkholes, and it spans 4 counties

Science Alert: According to reports from government officials in the Shaanxi province in northwest China, the collection of sinkholes was found during a recent survey of land around Hanzhong City.

These sinkholes - or tiankengs, as they’re also known - run along a 200-km-long 'karst' landform belt in the Qinling-Bashan Mountains of southwest Shaanxi...



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