Les Sables-d'Olonne (French pronunciation: [le sabl dɔlɔn] (listen); French meaning: "The Sands of Olonne") is a seaside town in Western France, on the Atlantic Ocean. A subprefecture of the department of Vendée, Pays de la Loire, it has the administrative level of commune. On 1 January 2019, the municipalities of Olonne-sur-Mer, Château-d'Olonne and Les Sables-d'Olonne merged, retaining the latter name.