- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°59'56"N 4°2'45"W
- Eastings/Northings: 262798, 346587
- OS Grid: SH627465
- Mapcode Local: GBR 5T.H1N8
- Mapcode Global: WH557.TWK8
Location and coordinates are for the approximate centre of Llyn yr Arddu within this administrative area.
Geographic features and populated places may cross administrative borders.