Passage du Gois
The Passage du Gois (French pronunciation: [pasaʒ dy ɡwa]) or Gôa is a causeway between Beauvoir-sur-Mer and the island of Noirmoutier, in Vendée, on the Atlantic coast of France. It is 4.125 kilometres (2.6 mi) long and floods twice a day during high tide. A road runs along the causeway.
Every year, a foot race—the Foulées du Gois—is held across it, starting at the onset of low tide, though professional athletes hold off until the water is as high as their shoes.