- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°5'10"N 4°1'9"W
- Eastings/Northings: 264859, 356239
- OS Grid: SH648562
- Mapcode Local: GBR 5V.9N4F
- Mapcode Global: WH54W.7PBD
Location and coordinates are for the approximate centre of Llyn Cwmffynnon within this administrative area.
Geographic features and populated places may cross administrative borders.