Montreuil-le-Gast (French pronunciation: [mɔ̃tʁœj lə ɡa]; Breton: Mousterel-ar-Gwast; Gallo: Montroelh-le-Gast) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Montreuil-le-Gast are called in French montreuillais.
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