A short drive south of Rock Hall the road crosses a narrow causeway onto Eastern Neck Island, 2,300 acres of tidal marsh, woodland, and brackish ponds protected as a National Wildlife Refuge. The island is a major stopover on the Atlantic Flyway. From November to March it fills with tundra swans, geese, ducks, and bald eagles; in spring and summer there are osprey, marsh wrens, and prothonotary warblers.
Several short trails cross the refuge and a long boardwalk crosses the marsh on the south side. There is no admission charge. Bring binoculars, insect repellent in summer, and a windbreak in winter — the bay wind cuts hard across the open water.