- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°52'54"N 3°41'58"W
- Eastings/Northings: 283119, 221716
- OS Grid: SN831217
- Mapcode Local: GBR Y8.RNYX
- Mapcode Global: VH5FJ.TYLW
Location and coordinates are for the approximate centre of Llyn y Fan Fawr within this administrative area.
Geographic features and populated places may cross administrative borders.