- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°18'17"N 4°35'16"W
- Eastings/Northings: 227668, 381787
- OS Grid: SH276817
- Mapcode Local: GBR HM1Z.37S
- Mapcode Global: WH42H.H6K7
Location and coordinates are for the approximate centre of Carreg Hanner-trai within this administrative area.
Geographic features and populated places may cross administrative borders.