- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°56'55"N 3°54'0"W
- Eastings/Northings: 269500, 229500
- OS Grid: SN695295
- Mapcode Local: GBR Y0.MF6P
- Mapcode Global: VH4HS.B9Z0
Location and coordinates are for the approximate centre of Afon Marlais within this administrative area.
Geographic features and populated places may cross administrative borders.