Iona Island is a 556-acre (2.2 km²) bedrock island, part of the Hudson River nature reserve in Stony Point, New York. It is part of Bear Mountain State Park The island is separated from the Hudson's western shore by mudflats and freshwater tidal marshes. It and its surrounding marsh was designated a National Natural Landmark in May 1974 as well as the Hudson River National Estuarine Research Reserve and a Significant Coastal Fish and Wildlife Habitat Area. It serves mainly as a bird sanctuary, particularly known as a winter nesting place for Bald Eagles.
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