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MN_0567_Winter oak silhouette at sunset.jpg
Oak tree silhouette at sunset in winter overlooking Louisville Swamp. Louisville Swamp is part of the Minnesota Valley National Wildlife Refuge. The Minnesota Valley National Wildlife Refuge is located within the urban and suburban areas of Minneapolis and St. Paul. It is a green belt of large marsh areas totaling approximately 14,000 acres, spanning 99 miles of the Minnesota River. This is one of only four American national wildlife refuges in an urban area, and the largest.