- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°1'22"N 4°51'8"W
- Eastings/Northings: 204393, 239899
- OS Grid: SN043398
- Mapcode Local: GBR CQ.GR1W
- Mapcode Global: VH1QH.VF23
Location and coordinates are for the approximate centre of Carreg Germain within this administrative area.
Geographic features and populated places may cross administrative borders.