- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°12'54"N 3°13'13"W
- Eastings/Northings: 316711, 258123
- OS Grid: SO167581
- Mapcode Local: GBR YX.2MS5
- Mapcode Global: VH69Q.4L9B
Location and coordinates are for the approximate centre of Llynheilyn within this administrative area.
Geographic features and populated places may cross administrative borders.