evidence: Azores and Madeira Islands occupy strategic locations along western sea approaches to Strait of Gibraltar; they are two of the four North Atlantic archipelagos that make up Macaronesia; the others are the Canary Islands (Spain) and Cabo Verde [...] embassy: Avenida das Forcas Armadas, 1600-081 Lisboa mailing address: 5320 Lisbon Place, Washington DC 20521-5320 telephone: [351] (21) 727-3300 [...] Portugal-Spain: Portugal does not recognize Spanish sovereignty over the territory of Olivenza based on a difference of interpretation of the 1815 Congress of Vienna and the 1801 Treaty of Badajoz