evidence: Gibraltar, British overseas territory occupying a narrow peninsula of Spain’s southern Mediterranean coast, just northeast of the Strait of Gibraltar, on the east side of the Bay of Gibraltar (Bay of Algeciras), and directly south of the Spanish city of La Línea. It is 3 miles (5 km) long and 0.75 mile (1.2 km) wide and is connected to Spain by a low, sandy isthmus that is 1 mile (1.6 km) long. Its name is derived from Arabic: Jabal Ṭāriq (Mount Tarik), honouring Ṭāriq ibn Ziyād, who captured the peninsula in 711. Gibraltar is a heavily fortified British air and naval base that guards the Strait of Gibraltar, which is the only entrance to the Mediterranean Sea from the Atlantic Ocean. Since the 18th century, Gibraltar has been a symbol of British naval strength, and it is commonly known in that context as "the Rock." [...] Passenger and cargo vessels stop at Gibraltar’s port, and ferries cross daily to Tangier, Morocco. Gibraltar has an international airport, and regular flights link the territory to London, Tangier, and many other destinations. The peninsula has a road system and a system of tunnels within the Rock for vehicular traffic. A cable car ascends to the central summit of the ridge. As the United Kingdom is not party to the Schengen Agreement, the crossing between La Linea and Gibraltar is one of the few remaining controlled internal borders in western Europe.