Lisbon metropolitan area
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 km, which is 3.3% of the total area of Portugal.
Lusitanian Basin
The Lusitanian Basin is located on both mainland and continental shelf of the west-central coast of Portugal. It covers a 20,000 km area and extends from south of Lisbon, the capitol of Portugal, to Porto. This north-south oriented Atlantic margin rift basin is approximately 130 km wide and 340 km long and belongs to a family of periatlantic basins such as the Jeanne d'Arc Basin. To the east of the Lusitanian Basin lies the Central Plateau of the Iberian Peninsula and a marginal horst system lies to the west. The Alentejo and Algarve Basins connect to the southern end of the Lusitanian Basin. In the north, it is connected to both the Porto and Galicia Basins via a basement ridge.