with the District of Santarém, Leiria and Santarém being cities of the same size and importance). The Regionalization experiment in Portugal was only successful among insular regions like in 1976, when the districts of Angra do Heroísmo, Horta and Ponta Delgada were substituted by the Autonomous Region of Açores with the seat of government being in Ponta Delgada, while the district of Funchal was replaced by the Autonomous Region of Madeira with a seat of government in Funchal. Overview The Lisbon metropolitan area, centered in the Portuguese capital city of Lisbon, is the largest population concentration in Portugal. The population in 2011 was 2,821,876, of whom 547,733 (19.4%) live in the city of Lisbon. About 26.7% of the total population of Portugal lives in the Lisbon metropolitan area. The area of the Lisbon metropolitan area is 3,015.24 km2, which is 3.3% of the total area of Portugal. The Lisbon metropolitan area has an active population of about 1.3 million people. With 32.7% of the national employment being located in its territory, the contribution of AML for the gross domestic product surpasses 36%. Today, the Lisbon metropolitan area territory is almost the same as Lisbon Region territory, being AML a union of metropolitan municipalities, and Lisbon Region a NUTS II region. It is bordered by the Oeste Intermunicipal Community (Central Region) to the north, Lezíria do Tejo to the northeast, Alentejo Central to the east and by Alentejo Litoral to the south, the former ones belonging to the wider Alentejo region. The municipalities north of the Tagus River are from Lisbon District (Grande Lisboa); those south of the river are from Setubal District (Península de Setúbal). Structure The metropolitan area of Lisbon was a semiofficial structure. Recently, Portugal has been incrementing the powers held by these territorial organization organs. In the officialization of the Lisbon Great Metropolitan Area, Azambuja left due to being mostly a rustic zone, more kindred to the city of Santarém which lies just 23 km northeast, while Lisbon is 45 km away from Azambuja, southeast. In the official AML site is said: As stated on the law 10/2003, of the 13 of May, the Grande Área Metropolitana de Lisboa (Lisbon Great Metropolitan Area) is a public collective person of associative nature, and of territorial scope that aims to reach common public interests of the municipalities that integrate it, that includes (18 City Halls) – Alcochete, Almada, Barreiro,