- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°19'17"N 3°45'42"W
- Eastings/Northings: 280010, 270717
- OS Grid: SN800707
- Mapcode Local: GBR 96.VSGR
- Mapcode Global: VH5CC.RX29
Location and coordinates are for the approximate centre of Llyn Fyrddon Fawr within this administrative area.
Geographic features and populated places may cross administrative borders.