Italy, officially the Italian Republic, is a unitary parliamentary republic in South-Central Europe. To the north, it borders France, Switzerland, Austria and Slovenia along the Alps. To the south, it consists of the entirety of the Italian Peninsula, Sicily, Sardinia–the two largest islands in the Mediterranean Sea - and many other smaller islands. The independent states of San Marino and the Vatican City are enclaves within Italy, whilst Campione d'Italia is an Italian exclave in Switzerland. The territory of Italy covers some 401,338 sq km and is influenced by a temperate seasonal climate. With 70.6 million inhabitants, it is the fifth most populous country in Europe, and the 19th most populous in the world.