Wertheim National Wildlife Refuge protects a rare undeveloped estuary landscape on Long Island’s south shore, centered on the Carmans River Estuary. Established in 1947 through Maurice Wertheim’s donation of 2,000 acres to the United States government, it was created to preserve habitat for migratory birds. Within one protected area, tidal water, marsh, woodland, grassland, and wetlands from fresh to salt water support diverse wildlife, including deer, osprey, muskrat, fox, turtles, frogs, fish, and about 300 bird species. Wintering waterfowl gather there in large numbers, and the refuge also serves as an important migration stop and a public gateway to Long Island’s natural estuary environment.