- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°31'2"N 3°44'51"W
- Eastings/Northings: 281500, 292500
- OS Grid: SN815925
- Mapcode Local: GBR 96.GHX1
- Mapcode Global: VH5BF.0Z1H
Location and coordinates are for the approximate centre of Llyn Cwm-byr within this administrative area.
Geographic features and populated places may cross administrative borders.