- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°1'6"N 4°1'11"W
- Eastings/Northings: 261500, 237500
- OS Grid: SN615375
- Mapcode Local: GBR DV.GTW1
- Mapcode Global: VH4HB.8JSD
Location and coordinates are for the approximate centre of Afon Marlais within this administrative area.
Geographic features and populated places may cross administrative borders.