The photo taken on May 21, 2008 shows the imprisoned lake on the Fujiang River in Pingtong Town of Pingwu County under Mianyang City, southwest China's Sichuan Province. The May 12 quake caused landslides in some places in Mianyang City and jammed nearby rivers in the gorges. Over 10 imprisoned lakes of high water level were thus formed. At present, the local water conservancy department keeps a 24-hour watch on these imprisoned lakes in case of floods. (Xinhua Photo)