- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°58'15"N 4°9'47"W
- Eastings/Northings: 251500, 232500
- OS Grid: SN515325
- Mapcode Local: GBR DN.KVB8
- Mapcode Global: VH3KZ.SQFB
Location and coordinates are for the approximate centre of Afon Marlais within this administrative area.
Geographic features and populated places may cross administrative borders.