Trou du Diable, Sea cave and entrance in Saint-Hilaire-de-Riez, France.
The cave opens into a 20-meter-long cavity within Silurian micaschist formations, featuring a large natural portal at an elevation of 5 meters.
The municipality installed safety barriers in 2010 to restrict access to a natural rock bridge that previously allowed visitors to cross above the cave entrance.
Local tales mention the Fradets, small mythological creatures inhabiting the marine cavities along the Corniche de Rié coastal area.
The cave entrance is accessible via Chemin Les Duprat walking path, with designated viewing areas protected by safety railings for visitor protection.
The site earned its name 'Devil's Hole' due to the water inside appearing to boil like a cauldron when waves enter the cavity.
Location: Saint-Hilaire-de-Riez
Elevation above the sea: 5 m
Address: Corniche Vendéenne, 85270, France
GPS coordinates: 46.69732,-1.97280
Latest update: October 22, 2025 11:55
List of natural, cultural, and historical sites in Vendée, including the Noirmoutier and Yeu islands, Puy du Fou, medieval castles, marshes, museums, beaches, and nature reserves. The department offers a variety of heritage between the Atlantic coast, farmland, and marshlands, with historical monuments from the Middle Ages to contemporary times.
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