- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°58'42"N 3°5'59"W
- Eastings/Northings: 326246, 342917
- OS Grid: SJ262429
- Mapcode Local: GBR 71.JHHC
- Mapcode Global: WH785.CD3G
Location and coordinates are for the approximate centre of Gwernydd Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.