- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°4'5"N 3°34'33"W
- Eastings/Northings: 294500, 353500
- OS Grid: SH945535
- Mapcode Local: GBR 6F.BMV0
- Mapcode Global: WH66F.14FM
Location and coordinates are for the approximate centre of Alwen Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.