Italy, officially the Italian Republic, is located on the Italian Peninsula in Southern Europe, and on the two largest islands in the Mediterranean Sea, Sicily and Sardinia. Italy shares its northern Alpine boundary with France, Switzerland, Austria and Slovenia. The independent states of San Marino and the Vatican City are enclaves within the Italian Peninsula, while Campione d'Italia is an Italian exclave in Switzerland.
Italy occupies a long, boot-shaped peninsula, surrounded on the west by the Tyrrhenian Sea and on the east by the Adriatic Sea. It is bounded by France, Switzerland, Austria, and Slovenia to the north. The Apennine Mountains form the peninsula's backbone; the Alps form its northern boundary. The largest of its northern lakes is Garda (143 sq mi; 370 km²); the Po, its principal river, flows from the Alps on Italy's western border and crosses the Padan plain to the Adriatic Sea. Several islands form part of Italy; the largest are Sicily (9,926 sq mi; 25,708 km²) and Sardinia (9,301 sq mi; 24,090 km²).
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