- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°18'58"N 4°37'24"W
- Eastings/Northings: 225335, 383145
- OS Grid: SH253831
- Mapcode Local: GBR GMYY.4WX
- Mapcode Global: WH314.YXH1
Location and coordinates are for the approximate centre of Ynys Halen within this administrative area.
Geographic features and populated places may cross administrative borders.