- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°51'47"N 5°19'56"W
- Eastings/Northings: 170664, 223527
- OS Grid: SM706235
- Mapcode Local: GBR C3.SS1G
- Mapcode Global: VH0TK.JFDL
Location and coordinates are for the approximate centre of Ynys Hwrddod within this administrative area.
Geographic features and populated places may cross administrative borders.