- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°17'4"N 3°19'54"W
- Eastings/Northings: 311306, 377222
- OS Grid: SJ113772
- Mapcode Local: GBR 5Z5G.G9
- Mapcode Global: WH76H.SPLW
Location and coordinates are for the approximate centre of Llyn Helyg within this administrative area.
Geographic features and populated places may cross administrative borders.