- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°1'19"N 4°14'58"W
- Eastings/Northings: 249210, 349565
- OS Grid: SH492495
- Mapcode Local: GBR 5K.FL5T
- Mapcode Global: WH440.P9LJ
Location and coordinates are for the approximate centre of Llyn Cwm Dulyn within this administrative area.
Geographic features and populated places may cross administrative borders.