41°29′46.91″N 71°20′28.1″W / 41.4963639°N 71.341139°WRose Island is an 18.5-acre (7.5 ha) island in Narragansett Bay off Newport, Rhode Island, United States. It is allegedly named "Rose Island" because at low tide the island appears to be shaped like a rose.[1] The Island is only accessible by boat. The island and its lighthouse are run by the private, non-profit Rose Island Lighthouse Foundation.