- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 49°54'15"N 6°20'23"W
- Eastings/Northings: 88500, 9500
- OS Grid: SV885095
- Mapcode Local: GBR BXQY.4VP
- Mapcode Global: VGYC4.2N8M
Location and coordinates are for the approximate centre of St Mary's Sound within this administrative area.
Geographic features and populated places may cross administrative borders.