- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°16'44"N 4°2'46"W
- Eastings/Northings: 260500, 266500
- OS Grid: SN605665
- Mapcode Local: GBR 8T.YGF0
- Mapcode Global: VH4FY.TZ9C
Location and coordinates are for the approximate centre of Llyn Eiddwen within this administrative area.
Geographic features and populated places may cross administrative borders.