Mont-Saint-Michel bay : Michelin's recommendations
About 100km of coastline border the bay of the Mont-St-Michel. The islands, cliffs, beaches and dunes form a series of ecosystems which are home to many species of flora and fauna. This part of the coast rewards visitors with stunning views of the Mont-St-Michel and walks along pleasant paths between polders and grassy fields. The first thing to do, however, is enquire about tides. Their amplitude in the bay is considerable, and the difference in sea level between high and low tide can be over 14m, which is the record in France. As the sea bed is flat, the sea retreats a long way, leaving 15km of sand exposed, and the incoming tide is very fast. While speeds of up to 25 to 30kph have been recorded, the average speed is about 3.75kph - the speed of a person walking. Quicksand is another important phenomenon in the bay. For decades the Mount has been silting up, and the sea deposits around 1 000 000m3 of sediment in the bay every year. Mankind is partly to be blamed because from the mid-19C to 1969, a certain number of constructions were built that accelerated the formation of polders (channels for navigation of the River Couesnon, a dike and a dam). Do not think of crossing the bay without a guide.