Mont Saint Michel ~ France Mont Saint-Michel: island commune in Normandy, France. It has 247 acres; a population of 44. The island has held strategic fortifications and since the eighth century AD has been the seat of the monastery. The structural composition of the town exemplifies the feudal society that constructed it. On top God, the abbey and monastery, below this the Great halls, then stores and housing, and at the bottom, outside the walls, fishermen and farmers' housing.