), officially the Italian Republic (Italian: Repubblica Italiana), is a unitary parliamentary republic in Europe. Italy covers an area of 301,338 km 2 (116,347 sq mi) and has a largely temperate climate; due to its shape, it is often referred to in Italy as lo Stivale (the Boot). With 61 million inhabitants, it is the 4th most populous EU member state. Located in the heart of the Mediterranean Sea, Italy shares open land borders with France, Switzerland, Austria, Slovenia, San Marino and Vatican City.