the two promontories at the E end of the Strait of Gibraltar: the Rock of Gibraltar on the European side and the Jebel Musa on the African side; according to legend, formed by Hercules
Pillars of Hercules in American English
two headlands on either side of the Strait of Gibraltar, one at Gibraltar (ancient Calpe) & the other at Ceuta (ancient , Abyla) or Jebel Musa, on the coast of Africa