- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°11'56"N 4°10'36"W
- Eastings/Northings: 248007, 146685
- OS Grid: SS480466
- Mapcode Local: GBR KK.4RPN
- Mapcode Global: VH3PV.K473
Location and coordinates are for the approximate centre of Mill Rock within this administrative area.
Geographic features and populated places may cross administrative borders.