The Pillars of Hercules is the ancient name referring to the two promontories at the eastern entrance to the Strait of Gibraltar, a narrow opening 14 kilometres wide between the Mediterranean Sea and the Atlantic Ocean separating the continents of Africa and Europe. The northern pillar is the Rock of Gibraltar and the southern pillar, Mons Abila, on the African site of the strait is not know for certain, but the two most likely candidates are Monte Hacho in Ceuta and Jebel Musa in Morocco.
