Bains-sur-Oust (French pronunciation: [bɛ̃ syʁ ust], literally Bains on Oust; Breton: Baen-Ballon, Gallo: Bein) is a commune in the Ille-et-Vilaine departement in Brittany in northwestern France.
Inhabitants of Bains-sur-Oust are called Bainsois in French.
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