- Category: Water Feature
- Type: Island
- Latitude/Longitude: 50°24'52"N 3°33'14"W
- Eastings/Northings: 289685, 58348
- OS Grid: SX896583
- Mapcode Local: GBR QT.TBJ6
- Mapcode Global: FRA 37FY.R6X
Location and coordinates are for the approximate centre of Armchair Rock within this administrative area.
Geographic features and populated places may cross administrative borders.