- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°10'16"N 3°54'32"W
- Eastings/Northings: 272500, 365500
- OS Grid: SH725655
- Mapcode Local: GBR 5Z.4BXN
- Mapcode Global: WH54J.XKS5
Location and coordinates are for the approximate centre of Llyn Eigiau Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.