The Rock of Gibraltar (from the Arabic name Jabal Ṭāriq جبل طارق, meaning "Mountain of Tariq") is a highly strategic monolithic limestone mountain, 426 m (1,398 ft) high, dominating the western entrance to the Mediterranean Sea. It is situated near the end of a narrow, 9 km (5.6 mi) long promontory stretching due south into the Mediterranean Sea and is located within the British territory of Gibraltar. It is 27 km northeast of Tarifa, Spain, the southwestern tip of Europe on the Iberian Peninsula. The rock serves as an impregnable fortress and contains a labyrinthine network of man-made tunnels known as the Tunnels of Gibraltar. Most of the Rock's upper area comprises a nature reserve that is home to about 300 Barbary macaques. It is a major tourist attraction.