- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°21'21"N 4°36'30"W
- Eastings/Northings: 226500, 387500
- OS Grid: SH265875
- Mapcode Local: GBR GMZT.ZSY
- Mapcode Global: WH423.5XS6
Location and coordinates are for the approximate centre of Holyhead Bay within this administrative area.
Geographic features and populated places may cross administrative borders.