Grandchamp-des-Fontaines (French pronunciation: [ɡʁɑ̃ʃɑ̃ de fɔ̃tɛn] ⓘ; before 2023: Grandchamps-des-Fontaines; Gallo: Graunchaun, Breton: Gregamp-ar-Feunteunioù) is a commune in the Loire-Atlantique department in western France.

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