- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°54'34"N 4°32'17"W
- Eastings/Northings: 225500, 226500
- OS Grid: SN255265
- Mapcode Local: GBR D4.PYT1
- Mapcode Global: VH2NQ.984F
Location and coordinates are for the approximate centre of Afon Sien within this administrative area.
Geographic features and populated places may cross administrative borders.