- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°8'28"N 4°4'57"W
- Eastings/Northings: 260796, 362487
- OS Grid: SH607624
- Mapcode Local: GBR 5R.64RN
- Mapcode Global: WH54N.894N
Location and coordinates are for the approximate centre of Marchlyn Bach within this administrative area.
Geographic features and populated places may cross administrative borders.