A wild duck is seen at Nanweng River National Nature Reserve, northeast China's Heilongjiang Province, June 17, 2015. As the largest nature reserve located at the highest latitude in China for forest-marsh wetland ecosystems in the cold-temperate zone, Nanweng River National Nature Reserve holds the most concentrated marsh wetlands in the forest of Dahinggan Mountains (Greater Hinggan Mountain). (Xinhua/Wang Kai)
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