- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°10'31"N 4°29'23"W
- Eastings/Northings: 233699, 367151
- OS Grid: SH336671
- Mapcode Local: GBR 57.3V4X
- Mapcode Global: WH434.0G90
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.