- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°54'41"N 3°57'1"W
- Eastings/Northings: 268945, 336691
- OS Grid: SH689366
- Mapcode Local: GBR 5Y.NLVH
- Mapcode Global: WH55W.923Q
Location and coordinates are for the approximate centre of Llyn Trawsfynydd within this administrative area.
Geographic features and populated places may cross administrative borders.