- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°52'34"N 4°2'38"W
- Eastings/Northings: 262531, 332939
- OS Grid: SH625329
- Mapcode Local: GBR 5T.QVGL
- Mapcode Global: WH55T.VYFV
Location and coordinates are for the approximate centre of Llyn y Fedw within this administrative area.
Geographic features and populated places may cross administrative borders.