Round Island is a small, uninhabited island in the Mississippi Sound, 6.5 kilometres (4.0 mi) south of Pascagoula, Mississippi, U.S.A. The island is a coastal preserve, situated in Jackson County and managed by the Mississippi Department of Marine Resources. The relatively isolated terrain—consisting of slash pine forest, interior marsh, and sandy beach—provides feeding, resting, and wintering habitat for migratory birds, including the brown pelican, white pelican, and cormorants. A number of rare or endangered species, including the Ruellia noctiflora, are found there.