HEILONGJIANG, June 19, Xinhua -- Nanwenghe Nature Reserve is located in eastern Daxing'anling forest area, in northeast China's Heilongjiang Province. It is the only protective wetland ecosystems in the cold temperate regions of China.

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Photo taken on June 18, 2015 shows an aerial view of the Nanwenghe wetland in northeast China's Heilongjiang Province(Xinhua/Wang Kai)

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Photo taken on June 18, 2015 shows an aerial view of the Nanwenghe wetland in northeast China's Heilongjiang Province. Nanwenghe Nature Reserve, located in eastern Daxing'anling forest area, is the only protective wetland ecosystems in the cold temperate regions of China. (Xinhua/Wang Kai)