Madrid is the capital and largest city of Spain, spanning a total of about 600 km². The city is located on the Manzanares river in the centre of the country. The metropolitan area is the third-largest in the European Union (after London and Paris) and has a population of around 6.5 million. Madrid is the political, economic and cultural centre of Spain and ranks among one of the greenest European cities. While the city has a modern infrastructure, it has retained the look and feel of its historic neighbourhoods and streets. Madrid is also famous for a legendary nightlife and party scene.