- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°9'1"N 4°5'14"W
- Eastings/Northings: 260500, 363500
- OS Grid: SH605635
- Mapcode Local: GBR 5R.5HLF
- Mapcode Global: WH54N.52VQ
Location and coordinates are for the approximate centre of Afon Marchlyn-mawr within this administrative area.
Geographic features and populated places may cross administrative borders.