- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°53'53"N 5°17'57"W
- Eastings/Northings: 173099, 227319
- OS Grid: SM730273
- Mapcode Local: GBR C4.QN5K
- Mapcode Global: VH0TD.3K88
Location and coordinates are for the approximate centre of Trwynhwrddyn within this administrative area.
Geographic features and populated places may cross administrative borders.