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 "Paris Region"; French: Région parisienne). The city of Paris within its administrative limits (largely unchanged since 1860) has an estimated population of 2,167,994 (January 2006). The Paris unité urbaine (or urban area) extends well beyond the administrative city limits and has an estimated population of 9.93 million (in 2005). The Paris aire urbaine (or metropolitan area) has a population of nearly 12 million and is one of the most populated metropolitan areas in Europe. An important settlement for more than two millennia, Paris is today one of the world's leading business and cultural centers, and its influence in politics, education, entertainment, media, fashion, science and the arts all contribute to its status as one of the world's major global cities. According to 2005 estimates by the PricewaterhouseCoopers accounting firm, the Paris urban area is Europe's biggest city economy and is fifth in the world's list of cities by GDP.