- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°43'10"N 3°34'7"W
- Eastings/Northings: 291725, 203475
- OS Grid: SN917034
- Mapcode Local: GBR HD.2YWN
- Mapcode Global: VH5GL.314N
Location and coordinates are for the approximate centre of Llyn Fawr within this administrative area.
Geographic features and populated places may cross administrative borders.