The Columbia Encyclopedia, Sixth Edition. 2001-07.
Pillars of Hercules
ancient mythological name for promontories flanking the east entrance to the Strait of Gibraltar. They are usually identified with Gibraltar in Europe and with Mt. Acha at Ceuta in Africa. The Jebel Musa (W of Ceuta) is also considered one of the pillars. They are also referred to as the Gates of Hercules.
