- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°53'34"N 4°51'8"W
- Eastings/Northings: 203837, 225444
- OS Grid: SN038254
- Mapcode Local: GBR CQ.QYY7
- Mapcode Global: VH1R2.VP58
Location and coordinates are for the approximate centre of Llys-y-frân Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.