- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°4'38"N 4°6'17"W
- Eastings/Northings: 259105, 355408
- OS Grid: SH591554
- Mapcode Local: GBR 5Q.B5CT
- Mapcode Global: WH54T.XXJ7
Location and coordinates are for the approximate centre of Llyn Ffynnon-y-gwas within this administrative area.
Geographic features and populated places may cross administrative borders.