One of hundreds of pits caused by cave-ins on farmland in Yuejiaqiao town, Yiyang city in Hunan province, Feb 26, 2012. Since Jan 1, 2012, karst cave-ins have occurred in many places of the town. Yiyang city has seen 693 karst cave-ins, including 537 in farmland and 150 in rivers. The geological disaster has damaged 167 houses and affected more than 1,200 local people. [Photo/Xinhua]
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