- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°6'5"N 5°5'39"W
- Eastings/Northings: 178816, 26979
- OS Grid: SW788269
- Mapcode Local: GBR ZC.LNZD
- Mapcode Global: FRA 086R.C4D
Location and coordinates are for the approximate centre of Mawnan Rock within this administrative area.
Geographic features and populated places may cross administrative borders.