- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°10'7"N 3°54'56"W
- Eastings/Northings: 272036, 365224
- OS Grid: SH720652
- Mapcode Local: GBR 5Z.499V
- Mapcode Global: WH54J.TMJ5
Location and coordinates are for the approximate centre of Llyn Eigiau within this administrative area.
Geographic features and populated places may cross administrative borders.