- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°51'9"N 5°19'59"W
- Eastings/Northings: 170549, 222376
- OS Grid: SM705223
- Mapcode Local: GBR C2.TKTN
- Mapcode Global: VH0TK.HPYL
Location and coordinates are for the approximate centre of Ynys Cantwr within this administrative area.
Geographic features and populated places may cross administrative borders.