Pillars of Hercules

The Pillars of Hercules are the promontories that flank the entrance to the Strait of Gibraltar. The northern Pillar, Calpe Mons, is the Rock of Gibraltar. A corresponding North African peak not being predominant, the identity of the southern Pillar, Abila Mons, has been disputed throughout history, with the two most likely candidates being Monte Hacho in Ceuta and Jebel Musa in Morocco. The term was applied in antiquity: Pliny the Elder included the Pillars of Hercules in his Naturalis historia (Book III:3).