- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°58'57"N 4°7'7"W
- Eastings/Northings: 257859, 344902
- OS Grid: SH578449
- Mapcode Local: GBR 5Q.J1ZB
- Mapcode Global: WH55D.P9X9
Location and coordinates are for the approximate centre of Cwm Oerddwr within this administrative area.
Geographic features and populated places may cross administrative borders.