Passage du Gois
The Passage de Gois or Gôa is a natural, periodically flooded passage leading to the island of Noirmoutier in France. It is located between Île de Noirmoutier and Beauvoir-sur-Mer, in the department of Vendée. It is flooded twice a day by the high tide.
The track is 4.125 kilometres (2.563 mi) long. Every year, a foot race – the Foulées du Gois – is held across it, starting at the onset of the high tide.