- Category: Water Feature
- Type: Island
- Latitude/Longitude: 49°56'37"N 6°22'23"W
- Eastings/Northings: 86368, 14017
- OS Grid: SV863140
- Mapcode Local: GBR BXNT.TWG
- Mapcode Global: VGYBX.HN4Y
Location and coordinates are for the approximate centre of Castle Bryher within this administrative area.
Geographic features and populated places may cross administrative borders.