Paris is the capital of France and the country's largest city. It is situated on the river Seine, in northern France, at the heart of the Île-de-France region (also known as the Région parisienne). The City of Paris, within its limits largely unchanged since 1860, has an estimated population of 2,167,994 (January 2006), but the Paris agglomeration (the Paris unité urbaine), of which the City of Paris is but a core, has an estimated population of 10,142,977 (in 2006). The Paris aire urbaine (or metropolitan area), or the Paris agglomeration plus its commuter belt, has a population of nearly 12 million, and is one of the most populated metropolitan areas in Europe.
Paris is one of the most popular tourist destinations in the world, with 45 million tourists every year in the Paris Region, 60% of whom are foreign visitors.
Paris is located in the north-bending arc of the river Seine and includes two islands, the Île Saint-Louis and the larger Île de la Cité, which form the oldest part of the city. Overall, the city is relatively flat, and the lowest elevation is 35 m above sea level. Paris has several prominent hills, of which the highest is Montmartre at 130 m.