Préfailles
Préfailles 
    Pradvael  | |
|---|---|
Commune  | |
Saint Gildas Point  | |
Location of Préfailles  | |
| Coordinates: 47°08′00″N 2°13′00″W / 47.1333°N 2.2167°W | |
| Country | France | 
| Region | Pays de la Loire | 
| Department | Loire-Atlantique | 
| Arrondissement | Saint-Nazaire | 
| Canton | Pornic | 
| Intercommunality | CA Pornic Agglo Pays de Retz | 
| Government | |
| • Mayor (2020–2026) | Claude Caudal | 
Area 1  | 4.72 km2 (1.82 sq mi) | 
| Population  (2022)  | 1,246 | 
| • Density | 260/km2 (680/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 44136 /44770  | 
| Elevation | 0–36 m (0–118 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Préfailles (French pronunciation: [pʁefaj] ⓘ; Breton: Pradvael) is a commune in the Loire-Atlantique department in western France.