Mon Louis Island, originally known as Isle aux Maraguans or Miragoine, is an island on the coast of the U.S. state of Alabama, south of Mobile. Located in southeastern Mobile County, it has an average elevation of 7 feet (2.1 m). Roughly 2 miles (3.2 km) wide and 6 miles (9.7 km) long, it is bounded by Fowl River on the north and west, Mobile Bay on the east, and the Mississippi Sound on the south. Mon Louis is traversed by Alabama State Route 193, which travels in a north to south direction along the eastern edge of the island. The Gordon Persons Bridge on the southern end of Route 193 connects the island to Dauphin Island. The unincorporated communities of Alabama Port, Heron Bay, and Mon Louis are located on the island.