The term 'ROCK of Gibraltar' is a reference to the ROCK of Gibraltar, a monolithic limestone promontory located in the British Overseas Territory of Gibraltar. It is connected to the Iberian Peninsula by the narrow STRAIT of Gibraltar, which is 6 letters long. The ROCK of Gibraltar is a popular tourist destination and is home to a variety of wildlife, including Barbary macaques, which are the only wild monkeys found in Europe.