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.
Algarve
Prior to the independence of Brazil, "United Kingdom of Portugal, Brazil and the Algarves" (1815–1822) was an official designation for Portugal which also alluded to the Algarve. Portuguese monarchs continued to use this title until the proclamation of the First Portuguese Republic in 1910. Between 1595 and 1808, the Algarve was a semiautonomous area of Portugal with its own governor, as well as a separate taxation system.
In the 15th century, Prince Henry the Navigator based himself near Lagos and conducted various maritime expeditions which established the colonies that comprised the Portuguese Empire. Also from Lagos, Gil Eanes set sail in 1434 to become the first seafarer to round Cape Bojador in West Africa. The voyages of discovery brought Lagos fame and fortune. Trade flourished and Lagos became the capital of the historical province of Algarve in 1577 and remained so until the fabled 1755 Lisbon earthquake. The earthquake damaged many areas in the Algarve and an accompanying tsunami destroyed or damaged coastal fortresses, while coastal towns and villages were heavily damaged except Faro, which was protected by the sandy banks of Ria Formosa lagoon. In Lagos, the waves reached the top of the city walls. For many Portuguese coastal regions, including the Algarve, the destructive effects of the tsunami were more disastrous than those of the earthquake itself.