Travers Island is a former island located on Long Island Sound in city of New Rochelle in Westchester County, New York. The island, originally united by a causeway to the mainland, comprises a tract of thirty acres in the Lower Harbor of New Rochelle, situated between Neptune Island, Glen Island and Hunter Island in New York City's Pelham Bay Park. The narrow strip of water originally making it an island was eventually filled in, converting this tract into a peninsula.