- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°21'34"N 4°25'18"W
- Eastings/Northings: 227836, 53888
- OS Grid: SX278538
- Mapcode Local: GBR NH.VQ0S
- Mapcode Global: FRA 18M2.WPL
Location and coordinates are for the approximate centre of Colmer Rocks within this administrative area.
Geographic features and populated places may cross administrative borders.