- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°57'50"N 5°8'19"W
- Eastings/Northings: 184470, 234171
- OS Grid: SM844341
- Mapcode Local: GBR CC.LD1B
- Mapcode Global: VH1QJ.WW7P
Location and coordinates are for the approximate centre of Ynys Deullyn within this administrative area.
Geographic features and populated places may cross administrative borders.