Corsica is a French island in the Mediterranean Sea. 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. Before French annexation, Corsica was under the ownership of the Republic of Genoa.
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.
Corsica is split 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. Bastia, the prefecture city of Haute-Corse, is the second-largest settlement in Corsica.