- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°5'1"N 3°10'11"W
- Eastings/Northings: 321734, 354695
- OS Grid: SJ217546
- Mapcode Local: GBR 6Y.9QH6
- Mapcode Global: WH77K.8RRB
Location and coordinates are for the approximate centre of Llyn Cyfynwy within this administrative area.
Geographic features and populated places may cross administrative borders.