- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°26'10"N 0°31'39"W
- Eastings/Northings: 502442, 171834
- OS Grid: TQ024718
- Mapcode Local: GBR GBD.Z9P
- Mapcode Global: VHFTP.S5X8
Location and coordinates are for the approximate centre of Hollyhock Island within this administrative area.
Geographic features and populated places may cross administrative borders.