pillars of hercules

plural noun

1. the two promontories on either side of the eastern end of the Strait of Gibraltar: the Rock of Gibraltar in Europe and the Jebel Musa in Africa; fabled to have been raised by Hercules.

pl n

1. 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