Mont Saint-Miche is a rocky tidal island and a commune in Normandy, France. It is located approximately one kilometre off the country's north-western coast, at the mouth of the Couesnon River near Avranches. The island has been a strategic point holding fortifications since ancient times, and since the 8th century AD it became the seat of the Saint-Michel monastery, from which it draws the name. The Mont-Saint-Michel and its bay are part of the UNESCO list of World Heritage Sites.
Mount San Michel is a medieval town called Avranches. The monastery, which gives the place it's name was fortified in the thirteenth century, with three cities whose fortifications and development are remarkable: Aigues Mortes (1270-1276), Carcassone, and Avignon (1309-1377). These fortified cities, called "bastides" marked the frontier of the kingdom at the end of the Middle Ages. More than 300 were built in France alone, between 1220 and 1350.