Fort Boyard is a fort located between the Île-d'Aix and the Île d'Oléron in the Pertuis d'Antioche straits, on the west coast of France. It is 61 metres long, 31 metres wide, and its walls are 20 metres high. The construction of the fort was first considered during a build-up of the French armed forces undertaken by Louis XIV between 1661 and 1667, but Vauban, his leading military engineer,
