Sardinia is a Mediterranean island belonging to which country?

Sardinia is an island and region of Italy, second in size only to Sicily among the islands of the western Mediterranean. It lies 120 miles west of the mainland of Italy, 7.5 miles south of the neighboring French island of Corsica, and 120 miles north of the coast of Africa. The capital is Cagliari. Sardinia is united geologically with Corsica, both being aligned along a mountain belt rising over 13,000 feet from the surrounding seafloor.

Source: Britannica