Passage du Gois, France
The Passage du Gois is a natural, periodically flooded passage leading to the island of Noirmoutier in France. It is flooded twice a day by the high tide. Length of this track is 4.125 km. You need to be aware of tide times before driving here or you might disappear beneath the water. The danger doesn’t go even after the tide goes because water leaves the road slippery.