Gibraltar is a British Overseas Territory located at the southern tip of the Iberian Peninsula. It is dominated by the Rock of Gibraltar, a 426-meter-high limestone monolith. It overlooks the Strait of Gibraltar, which is the only natural link between the Atlantic Ocean and the Mediterranean Sea. At its narrowest point, the strait is only 14.3 kilometers wide, separating Europe from Africa (Spain from Morocco). Gibraltar has a unique geography; its airport runway actually intersects with a major city street (Winston Churchill Avenue), which must be closed every time a plane lands or takes off. It is also famous for being the only place in Europe with a wild population of monkeys, the Barbary macaques.