- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°50'8"N 4°43'40"W
- Eastings/Northings: 216350, 329957
- OS Grid: SH163299
- Mapcode Local: GBR GPP6.C4C
- Mapcode Global: WH33F.BZWG
Location and coordinates are for the approximate centre of Carreg y Trai within this administrative area.
Geographic features and populated places may cross administrative borders.