The commune of "Le Château d'Oléron" is located on the south-east coast of the island of "Oléron", the second largest island in metropolitan France, in the department of "Charente-Maritime". The town is surrounded to the south by the commune of Saint-Trojan-les-Bains, to the southwest by "Bourcefranc-le-Chapus" (on the mainland), to the north by "Dolus-d'Oléron", and to the west by "Le Grand-Village-Plage".