- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 55°35'48"N 6°19'59"W
- Eastings/Northings: 127133, 642200
- OS Grid: NR271422
- Mapcode Local: GBR BFRX.MXS
- Mapcode Global: WGYHR.PLFC
Location and coordinates are for the approximate centre of Alt Dreasain within this administrative area.
Geographic features and populated places may cross administrative borders.