- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°16'17"N 4°19'59"W
- Eastings/Northings: 244500, 377500
- OS Grid: SH445775
- Mapcode Local: GBR HNN1.RV3
- Mapcode Global: WH42T.D1R7
Location and coordinates are for the approximate centre of Cefni Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.