- Category: Populated Place
- Type: Other Settlement
- Latitude/Longitude: 51°38'42"N 3°45'26"W
- Eastings/Northings: 278500, 195500
- OS Grid: SS785955
- Mapcode Local: GBR H4.7KMN
- Mapcode Global: VH5GN.TXH6
Location and coordinates are for the approximate centre of Efail-fach within this administrative area.
Geographic features and populated places may cross administrative borders.