- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°12'0"N 4°30'15"W
- Eastings/Northings: 232829, 369917
- OS Grid: SH328699
- Mapcode Local: GBR 56.2J9Z
- Mapcode Global: WH42X.STBP
Location and coordinates are for the approximate centre of Ynysoedd Duon within this administrative area.
Geographic features and populated places may cross administrative borders.