 The tidal marsh, coves and creeks, and vegetated ridges of the refuge form an important stopover and wintering area for thousands of migratory waterfowl and nesting habitat for various wildlife species.Martin National Wildlife Refuge is the largest unit of the Chesapeake Islands Refuges, which also includes Spring Island, Barren Island, and Bishops Head in Dorchester County, Maryland.The management of the Chesapeake Islands Refuges falls under the umbrella of the Chesapeake Marshlands National Wildlife Refuge Complex.