- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°19'6"N 4°1'38"W
- Eastings/Northings: 265056, 382102
- OS Grid: SH650821
- Mapcode Local: GBR 0Z92.X2
- Mapcode Global: WH53Q.3VJ8
Location and coordinates are for the approximate centre of Ynys Seiriol within this administrative area.
Geographic features and populated places may cross administrative borders.