- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°55'38"N 3°43'1"W
- Eastings/Northings: 284677, 338049
- OS Grid: SH846380
- Mapcode Local: GBR 67.MPKR
- Mapcode Global: WH66X.WP54
Location and coordinates are for the approximate centre of Llyn Arenig Fawr within this administrative area.
Geographic features and populated places may cross administrative borders.