Navarone is a fictional gun site featured in the 1961 novel 'The Guns of Navarone' by Alistair MacLean. It is a heavily fortified island in the Aegean Sea, which is the setting for a mission to destroy two large German guns that prevent Allied ships from passing through. The mission is eventually successful, and the guns are destroyed. The term 'Navarone' has since become synonymous with any heavily fortified or difficult-to-reach target.