- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 51°55'34"N 5°14'17"W
- Eastings/Northings: 177452, 230254
- OS Grid: SM774302
- Mapcode Local: GBR C6.NZ80
- Mapcode Global: VH0T7.5V47
Location and coordinates are for the approximate centre of Porth Tre-wen within this administrative area.
Geographic features and populated places may cross administrative borders.