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Belém Tower (in Portuguese Torre de Belém, pronounced: [ˈtoʁ(ɨ) dɨ bɨˈlɐ̃ȷ̃]) or the Tower of St Vincent is a fortified tower located in the civil parish of Santa Maria de Belém in the municipality of Lisbon, Portugal. It is an UNESCO World Heritage Site (along with the nearby Jerónimos Monastery) because of the significant role it played in the Portuguese maritime discoveries of the era of the Age of Discoveries. The tower was commissioned by King John II to be part of a defense system at the mouth of the Tagus River and a ceremonial gateway to Lisbon.

The tower was built in the early 16th century and is a prominent example of the Portuguese Manueline style, but it also incorporates hints of other architectural styles. The structure was built from lioz limestone and is composed of a bastion and the 30 meter (100 foot), four story tower. It has incorrectly been stated that the tower was built in the middle of the Tagus and now sits near the shore because the river was redirected after the 1755 Lisbon earthquake. In fact, the tower was built on a small island in the Tagus River near the Lisbon shore.

Lisbon (/ˈlɪzbən/; Portuguese: Lisboa, IPA: [liʒˈβoɐ]) is the capital city and largest city of Portugal with a population of 545,245 within its administrative limits on a land area of 84.8 km² (33 sq mi). The urban area of Lisbon extends beyond the administrative city limits with a population of 3 million on an area of 958 km² (370 sq mi), making it the 9th most populous urban area in the European Union. About 2,831,000 people live in the Lisbon Metropolitan Area (which represents approximately 27% of the population of the country). Lisbon is the westernmost large city located in Europe, as well as its westernmost capital city and the only one along the Atlantic coast. It lies in the western Iberian Peninsula on the Atlantic Ocean and the Tagus River.

Portugal ⁱ/ˈpɔrtʃʉɡəl/ (Portuguese: Portugal, IPA: [puɾtuˈɣaɫ]), officially the Portuguese Republic (Portuguese: República Portuguesa) is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the Azores and Madeira are part of Portugal. The country is named after its second largest city, Porto, whose Latin name was Portus Cale.

Lisbon District (Portuguese pronunciation: [liʒˈβoɐ], Portuguese: Distrito de Lisboa) is a district located in the South Central Portugal, the district capital is the city of Lisbon, also the national capital.

The district is composed of 16 municipalities: