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
See Pillars of Hercules in American Heritage Dictionary 4
The ancient name for two promontories at the eastern end of the Strait of Gibraltar and the entrance to the Mediterranean Sea. They are usually identified as Gibraltar in Europe and Jebel Musa in North Africa.