- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°55'48"N 3°48'12"W
- Eastings/Northings: 278865, 338489
- OS Grid: SH788384
- Mapcode Local: GBR 64.MDJS
- Mapcode Global: WH66W.JMZ2
Location and coordinates are for the approximate centre of Llyn Tryweryn within this administrative area.
Geographic features and populated places may cross administrative borders.