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Firs are seen in the Potatso National Park in Shangri-La, southwest China's Yunnan Province, Oct. 13, 2008. Located at the center of the "Three Parallel Rivers" world natural heritage site, the Potatso National Park is composed of the Shudu Lake, Niru area and Bitahai Nature Reserve, with an area of 1,313 square kilometers. [Xinhua]