Montreuil-le-Gast
Montreuil-le-Gast 
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The town hall of Montreuil-le-Gast  | |
Location of Montreuil-le-Gast  | |
| Coordinates: 48°14′52″N 1°43′32″W / 48.2478°N 1.7256°W | |
| Country | France | 
| Region | Brittany | 
| Department | Ille-et-Vilaine | 
| Arrondissement | Rennes | 
| Canton | Melesse | 
| Intercommunality | Val d'Ille-Aubigné | 
| Government | |
| • Mayor (2020–2026) | Lionel Henry | 
Area 1  | 9.14 km2 (3.53 sq mi) | 
| Population  (2022)  | 2,048 | 
| • Density | 220/km2 (580/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 35193 /35520  | 
| Elevation | 65–122 m (213–400 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
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.