- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°25'23"N 4°23'52"W
- Eastings/Northings: 240752, 394503
- OS Grid: SH407945
- Mapcode Local: GBR HMJN.658
- Mapcode Global: WH420.D7X1
Location and coordinates are for the approximate centre of Porth Ynys-wair within this administrative area.
Geographic features and populated places may cross administrative borders.