The Barcelona Metropolitan Area (AMB) is the public administration of the metropolitan area of Barcelona, which occupies 636 km² and encompasses 36 municipalities with more than 3.2 million inhabitants.
The metropolitan area is a territorial, social, demographic, economic and cultural entity formed during the last century as a product of the growth and connection of urban systems around the city of Barcelona. This is the largest metropolitan conurbation in the western Mediterranean, which generates half of the GDP in Catalonia.
AMB management areas are related to territory and urban planning, mobility, housing, environment economic development and social cohesion.
AMB is responsible for planning and managing public transport (bus and metro) in the metropolitan area of Barcelona. Its competencies include planning of mobility and public transport services, the provision of bus, metro and taxi services and the planning of sustainable mobility.