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Galop Island is an uninhabited island in the Saint Lawrence River located in St. Lawrence County, northeast of Ogdensburg, New York. The 675-acre (2.73 km2) island is owned by the New York Power Authority and managed by the New York State Office of Parks, Recreation and Historic Preservation as the undeveloped Galop Island State Park. Galop Island has historically been known by a variety of names, including Isle Aux Galloup, Gallou Island, Butternut Island, Dillingham Island, Dixon Island, Lalone Island, Lotus Island, Round Island, Sears Island, Big Island, and Twin Island.