- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°19'20"N 4°41'1"W
- Eastings/Northings: 221353, 383958
- OS Grid: SH213839
- Mapcode Local: GBR GMTX.M9Y
- Mapcode Global: WH314.0RYF
Location and coordinates are for the approximate centre of Ynys Arw within this administrative area.
Geographic features and populated places may cross administrative borders.