- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°52'54"N 4°0'54"W
- Eastings/Northings: 264500, 333500
- OS Grid: SH645335
- Mapcode Local: GBR 5V.QH4Z
- Mapcode Global: WH55V.9T9L
Location and coordinates are for the approximate centre of Llyn Eiddew-mawr within this administrative area.
Geographic features and populated places may cross administrative borders.