Paris is the capital city of France. It is situated on the River Seine, in northern France, at the heart of the Île-de-France region ("Région parisienne"). The City of Paris has an estimated population of 2,153,600 within its administrative limits.[2] The Paris unité urbaine (or urban area) is an area of unbroken urban growth that extends well beyond the administrative city limits and has a population of 9.93 million.[3] A commuter belt around the unité urbaine completes the Paris aire urbaine (or metropolitan area) that, with its population of 12 million,[4] is one of the most heavily populated areas in Europe.[5]