Paris is the capital and largest city of France, with an estimated city population of 2,048,472 in an area of 105.4 km2 (40.7 sq mi), and a metropolitan population of 13,171,056 as of January 2025. Located on the river Seine in the centre of the Île-de-France region, it is the largest metropolitan area and fourth-most populous city in the European Union (EU). Nicknamed the City of Light, partly because of its role in the Age of Enlightenment, Paris has been one of the world's major centres of finance, diplomacy, commerce, culture, fashion, and gastronomy since the 17th century.