Isla San IldefonsoIsla San Ildefonso, is an island in the Gulf of California east of the Baja California Peninsula. The island is uninhabited and is part of the Mulegé Municipality.BiologyIsla San Ildefonso has four species of reptile: Coluber flagellum, Phyllodactylus nocticolus, Sceloporus orcutti, and Uta stansburiana.