Corsica is an island in the Mediterranean Sea belonging to France. It is located west of Italy, southeast of the French mainland, and north of the Italian island of Sardinia. Mountains make up two-thirds of the island, forming a single chain. Corsica is one of the 27 régions of France, although it is designated as a territorial collectivity (collectivité territoriale) by law. As a territorial collectivity, Corsica enjoys some greater powers than other French régions but is referred to as a région in common speech and is almost always listed among them. Although the island is separated from the continental mainland by the Ligurian Sea and is closer to Italy than to the French mainland, politically Corsica is part of Metropolitan France.