- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°55'10"N 4°7'41"W
- Eastings/Northings: 257020, 337920
- OS Grid: SH570379
- Mapcode Local: GBR 5P.N5PF
- Mapcode Global: WH55L.KWG4
Location and coordinates are for the approximate centre of Cei Ballast within this administrative area.
Geographic features and populated places may cross administrative borders.