- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°47'35"N 3°26'38"W
- Eastings/Northings: 300500, 211500
- OS Grid: SO005115
- Mapcode Local: GBR YM.Y69Z
- Mapcode Global: VH6CQ.8623
Location and coordinates are for the approximate centre of Llwyn-on Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.