- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 53°3'48"N 3°54'14"W
- Eastings/Northings: 272500, 353500
- OS Grid: SH725535
- Mapcode Local: GBR 60.C03F
- Mapcode Global: WH554.0859
Location and coordinates are for the approximate centre of Afon Ystumiau within this administrative area.
Geographic features and populated places may cross administrative borders.