Montreuil-le-Gast

Montreuil-le-Gast (Mousterel-ar-Gwast; Gallo: Montroelh-le-Gast) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.

Population
Inhabitants of Montreuil-le-Gast are called in French montreuillais.