- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°4'5"N 4°9'29"W
- Eastings/Northings: 255500, 354500
- OS Grid: SH555545
- Mapcode Local: GBR 5N.BQDX
- Mapcode Global: WH550.347Q
Location and coordinates are for the approximate centre of Llyn Cwellyn within this administrative area.
Geographic features and populated places may cross administrative borders.