Passage du Gois — a road lined on the bottom of the bay, which connects mainland France with the island Noirmoutier.
Twice a day, after the low tide, it becomes available for a few hours, the rest of the time it is flooded to a level of 4 meters.
The natural transition between the island and the mainland was first marked on the map in 1701. In 1840 there was built the road that allowed to move on horseback and in carts. Now the length of the road is 4.5 kilometers.
