La Faute-sur-Mer (French pronunciation: [la fot syʁ mɛʁ], literally La Faute on Sea) is a former commune in the Vendée department in the Pays de la Loire region in western France.

It was merged with L'Aiguillon-sur-Mer to form L'Aiguillon-la-Presqu'île on 1 January 2022.

[2] The river Lay forms all of the commune's eastern border, then flows into the Atlantic Ocean, which forms all of its western border.

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