- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°34'22"N 3°38'48"W
- Eastings/Northings: 288500, 298500
- OS Grid: SN885985
- Mapcode Local: GBR 9B.BYMB
- Mapcode Global: WH68P.YLNF
Location and coordinates are for the approximate centre of Afon Twymyn within this administrative area.
Geographic features and populated places may cross administrative borders.