- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°18'42"N 4°17'29"W
- Eastings/Northings: 247429, 381874
- OS Grid: SH474818
- Mapcode Local: GBR HMSY.DXX
- Mapcode Global: WH42N.10PX
Location and coordinates are for the approximate centre of Llyn yr Wyth-Eidion within this administrative area.
Geographic features and populated places may cross administrative borders.