- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 51°52'2"N 5°16'48"W
- Eastings/Northings: 174281, 223833
- OS Grid: SM742238
- Mapcode Local: GBR C5.SF0W
- Mapcode Global: VH0TL.FBJC
Location and coordinates are for the approximate centre of Porth Clais within this administrative area.
Geographic features and populated places may cross administrative borders.