- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°57'37"N 3°44'48"W
- Eastings/Northings: 282770, 341766
- OS Grid: SH827417
- Mapcode Local: GBR 66.KGCS
- Mapcode Global: WH66Q.FV2C
Location and coordinates are for the approximate centre of Llyn Arenig Fach within this administrative area.
Geographic features and populated places may cross administrative borders.