Wikipedia article: Mont Saint-Michel. Quote:
Mont Saint-Michel 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 population of the island is 41, as of 2006. 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.