evidence: Portugal,[e] officially the Portuguese Republic,[f] is a country located on the Iberian Peninsula in Southwestern Europe, whose territory also includes the Macaronesian archipelagos of the Azores and Madeira. It features the westernmost point in continental Europe; its mainland west and south border with the North Atlantic Ocean; and in the north and east, the Portugal-Spain border, which constitutes the longest uninterrupted border line in the European Union. Portugal is the oldest nation-state in Europe. Founded in 1143, its current borders were established in mid-13th century, making them some of the most ancient in Europe and the world. Its archipelagos form two autonomous regions with their own regional governments. On the mainland, the Alentejo region occupies the biggest area but is one of the least densely populated regions of Europe. Lisbon is the capital and largest city by population, and it is also the main spot for tourists alongside Porto, the Algarve and Madeira. [...] Continental Portugal's 89,015 km2 (34,369 sq mi) territory is serviced by four international airports located near the principal cities of Lisbon, Porto, Faro and Beja. Lisbon's geographical position makes it a stopover for many foreign airlines at several airports within the country. The primary flag-carrier is TAP Air Portugal, although many other domestic airlines provide services within and without the country.