- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°46'57"N 4°2'24"W
- Eastings/Northings: 262500, 322500
- OS Grid: SH625225
- Mapcode Local: GBR 5T.XP37
- Mapcode Global: WH56D.XB96
Location and coordinates are for the approximate centre of Llyn Irddyn within this administrative area.
Geographic features and populated places may cross administrative borders.