Corsica (/ˈkɔ:rsɪkə/; French: Corse [kɔʁs]; Corsica in Corsican and Italian, pronounced [ˈkorsiga] and [ˈkɔrsika] respectively) is an island in the Mediterranean Sea and one of the 18 regions of France. It is located southeast of the French mainland and west of the Italian Peninsula, with the nearest land mass being the Italian island of Sardinia to the immediate south. A single chain of mountains makes up two-thirds of the island.