- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°55'26"N 4°1'26"W
- Eastings/Northings: 264029, 338211
- OS Grid: SH640382
- Mapcode Local: GBR 5V.MT46
- Mapcode Global: WH55N.5R1R
Location and coordinates are for the approximate centre of Llyn Tecwyn Uchaf within this administrative area.
Geographic features and populated places may cross administrative borders.