- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°23'13"N 4°15'15"W
- Eastings/Northings: 250172, 390162
- OS Grid: SH501901
- Mapcode Local: GBR HMVR.CZ8
- Mapcode Global: WH428.M4B9
Location and coordinates are for the approximate centre of Ynys Dulas within this administrative area.
Geographic features and populated places may cross administrative borders.