Gibraltar

noun

1. location of a colony of the United Kingdom on a limestone promontory at the southern tip of Spain; strategically important because it can control the entrance of ships into the Mediterranean; one of the Pillars of Hercules

   noun.location

   Synonyms calpe rock of gibraltar

   Source: WordNet 3.0

2. A strongly fortified town on the south coast of Spain, held by the British since 1704; hence, an impregnable stronghold.

   noun

   Source: webster1913