Le Château-d'Oléron (French pronunciation: [lə ʃɑto dɔleʁɔ̃]; Occitan: Lo Chasteu d'Olairon, before 1962: Le Château)[3] is a commune located on the Island of Oléron, in the Charente-Maritime department, southwestern France.

The town is surrounded by fortifications in the form of a Bastion fort (similar to a "star fort".)

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