Barcelona (Catalan: [bərsəˈɫonə], Spanish: [barθeˈlona]) is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of 101.4 km2 (39 sq mi). The urban area of Barcelona extends beyond the administrative city limits with a population of between 4,200,000[1] and 4,500,000[2] on an area of 803 km2 (310 sq mi),[1] being the sixth-most populous urban area in the European Union after Paris, London, Ruhr area, Madrid and Milan. About five million[3][4][5] people live in the Barcelona metropolitan area. It is also Europe's largest metropolis on the Mediterranean coast. It is the main component of an administrative area of Greater Barcelona, with a population of 3,218,071 in an area of 636 km² (density 5,060 hab/km²). It is located on the Mediterranean coast between the mouths of the rivers Llobregat and Besòs and is bounded to the west by the Serra de Collserola ridge (512 m/1,680 ft).
Reference: http://en.wikipedia.org/wiki/Barcelona,_Spain