The Pillars of Hercules[a] 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,[1] 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).
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