Corsica is adjacent to Haute-Corse.
Corsica ( [ ˈkɔrsɪkə ] Corse [ kɔʁs ] Corsican and Italian : Corsica [ ˈkɔrsika ] ) is an island in the Mediterranean Sea and one of the 13 regions of France . The island formed a single department until it was split in 1975 into two departments : Haute-Corse ( Upper Corsica ) and Corse-du-Sud ( Southern Corsica ) , with its regional capital in Ajaccio , the prefecture city of Corse-du-Sud .