- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°13'9"N 4°21'55"W
- Eastings/Northings: 238520, 260524
- OS Grid: SN385605
- Mapcode Local: GBR DC.2CW2
- Mapcode Global: VH3JQ.9H33
Location and coordinates are for the approximate centre of Carreg Walltog within this administrative area.
Geographic features and populated places may cross administrative borders.