Château-Larcher (French pronunciation: [ʃɑto laʁʃe]; Poitevin: Chât'lachèr / Chatelarchér) is a commune in the Vienne department in the Nouvelle-Aquitaine region in western France.

The Clouère flows northwestward through the middle of the commune, forms part of its north-eastern border, then flows into the Clain, which forms its north-western border.

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