Barcelona is the capital, most populous city of the Autonomous Community of Catalonia and the second largest city in Spain, with a population of 1,615,908 in 2008. It is the eleventh-most populous municipality in the European Union and sixth-most populous urban area in the European Union after Paris, London, Ruhr Area, Madrid and Milan with the population 4,185,000. 4,9 million people live in Barcelona metropolitan area. The main part of a union of adjacent cities and municipalities named Área Metropolitana de Barcelona (AMB) with a population of 3,186,461 in area of 636 km² (density 5.010 hab/km²). Barcelona is Europe's largest city on the Mediterranean coast.

It is located on the Mediterranean coast (41°23′N 2°11′E / 41.383°N 2.183°E / 41.383; 2.183) 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).

Barcelona is recognised as a global city because of its importance in finance, commerce, media, entertainment, arts and international trade. Barcelona is a major economic centre with one of Europe's principal Mediterranean ports, and Barcelona International Airport is the second largest in Spain after the Madrid-Barajas Airport (handles about 30 million passengers per year). Founded as a Roman city, Barcelona became the capital of the Counts of Barcelona. After merging with the Kingdom of Aragon, it became one of the most important cities of ...