Langast
Langast 
    Lanwal  | |
|---|---|
Part of Plouguenast-Langast   | |
The church of Saint-Gal, in Langast  | |
Location of Langast  | |
| Coordinates: 48°16′51″N 2°39′45″W / 48.2808°N 2.6625°W | |
| Country | France | 
| Region | Brittany | 
| Department | Côtes-d'Armor | 
| Arrondissement | Saint-Brieuc | 
| Canton | Guerlédan | 
| Commune | Plouguenast-Langast | 
Area 1  | 20.45 km2 (7.90 sq mi) | 
| Population  (2022)  | 565 | 
| • Density | 28/km2 (72/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal code | 22150  | 
| Elevation | 104–240 m (341–787 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Langast (French pronunciation: [lɑ̃ɡa]; Breton: Lanwal; Gallo: Langau) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Plouguenast-Langast.