- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°0'42"N 3°57'38"W
- Eastings/Northings: 268548, 347842
- OS Grid: SH685478
- Mapcode Local: GBR 5X.GBBF
- Mapcode Global: WH559.4K5J
Location and coordinates are for the approximate centre of Llyn Iwerddon within this administrative area.
Geographic features and populated places may cross administrative borders.