- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°13'54"N 4°9'8"W
- Eastings/Northings: 256431, 372704
- OS Grid: SH564727
- Mapcode Local: GBR 5N.0KS4
- Mapcode Global: WH547.51X5
Location and coordinates are for the approximate centre of Ynys Castell within this administrative area.
Geographic features and populated places may cross administrative borders.