- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°18'11"N 3°57'4"W
- Eastings/Northings: 261142, 46618
- OS Grid: SX611466
- Mapcode Local: GBR Q5.RJTB
- Mapcode Global: FRA 28M7.DHC
Location and coordinates are for the approximate centre of East Mary's Rock within this administrative area.
Geographic features and populated places may cross administrative borders.