The Lisbon metropolitan area is an administrative division that includes 18 municipalities in Portugal and is a designated Level II and Level III Portuguese NUTS region.
It is the most populous metropolitan area of Portugal, counting 2 812 678 inhabitants in 2015, as well as the second most populous region of the country, after the Northern Region. It is bordered by the Oeste Intermunicipal Community 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.
As an administrative entity, the Lisbon metropolitan area was only created in 1991 in order to meet the needs of urban territories with a large population density surrounding the Portuguese capital.
Wikipedia https://en.wikipedia.org/wiki/Lisbon_Metropolitan_Area
Coordinates 38°42'27.903" N -9°8'11.731" E