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Italy (Italian: Italia [iˈtaːlja]), officially the Italian Republic (Italian: Repubblica Italiana), is a unitary parliamentary republic in Europe.[note 1] Italy covers an area of 301,338 km2 (116,347 sq mi) and has a largely temperate seasonal 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. Since classical times, Greeks, Etruscans and Celts have inhabited the south, centre and north of the Italian Peninsula respectively. The Italic tribe known as the Latins formed the Roman Kingdom, which eventually spread throughout Italy, assimilating and conquering other nearby civilizations and forming the Roman Republic. Rome ultimately emerged as the dominant power, conquering much of the ancient world and becoming the leading cultural, political, and religious centre of Western civilisation. The legacy of the Roman Empire is widespread and can be observed in the global distribution of civilian law, Republican governments, Christianity and the latin script.