- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°17'13"N 3°19'44"W
- Eastings/Northings: 311500, 377500
- OS Grid: SJ115775
- Mapcode Local: GBR 5Z6F.2D
- Mapcode Global: WH76H.TMYY
Location and coordinates are for the approximate centre of Llyn Helyg within this administrative area.
Geographic features and populated places may cross administrative borders.