- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°39'35"N 3°16'33"W
- Eastings/Northings: 309913, 85240
- OS Grid: SY099852
- Mapcode Local: GBR P7.T2YB
- Mapcode Global: FRA 470B.KKK
Location and coordinates are for the approximate centre of Hern Rock within this administrative area.
Geographic features and populated places may cross administrative borders.