Very very crowed spot on summer best to go out of season, extremely beautiful

In prehistoric times the bay was land. As sea levels rose erosion shaped the coastal landscape over millions of years. Several blocks of granite or granulite emerged in the bay, having resisted the wear and tear of the ocean better than the surrounding rocks. These included Lillemer, the Mont-Dol, Tombelaine and Mont Tombe, later called Mont-Saint-Michel.

The Mont-Saint-Michel has also been the subject of traditional, but nowadays good-humoured, rivalry between Normans and Bretons. More Info at: http://en.wikipedia.org/wiki/Mont_Saint-Michel