Paris (UK: /ˈpærɪs/ PARR-iss; US: /ˈpɛərɪs/ PAIR-iss; French: [paʁi]) is the capital and most populous city of France. Situated on the Seine River, in the north of the country, it is in the centre of the Île-de-France region, also known as the région parisienne, "Paris Region". The City of Paris has an area of 105 km² (41 mi²) and a population of 2,241,346 (2014 estimate) within its administrative borders essentially unchanged since 1860. Since the 19th century, the built-up area of Paris has grown far beyond its administrative borders; together with its suburbs, the whole agglomeration has a population of 10,550,350 (Jan. 2012 census). Paris' metropolitan area spans most of the Paris region and has a population of 12,341,418 (Jan. 2012 census), or one-fifth of the population of France.