- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°21'23"N 4°13'46"W
- Eastings/Northings: 251714, 386720
- OS Grid: SH517867
- Mapcode Local: GBR HMXT.Z6L
- Mapcode Global: WH53F.0W6Q
Location and coordinates are for the approximate centre of Porth yr Ynys within this administrative area.
Geographic features and populated places may cross administrative borders.