- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°0'44"N 4°0'19"W
- Eastings/Northings: 265548, 347988
- OS Grid: SH655479
- Mapcode Local: GBR 5V.GCGL
- Mapcode Global: WH558.FKV1
Location and coordinates are for the approximate centre of Llyn yr Adar within this administrative area.
Geographic features and populated places may cross administrative borders.