- Category: Landcover
- Type: Forest or Wood
- Latitude/Longitude: 51°50'21"N 4°21'33"W
- Eastings/Northings: 237555, 218280
- OS Grid: SN375182
- Mapcode Local: GBR DD.V7BH
- Mapcode Global: VH3LN.D177
Location and coordinates are for the approximate centre of Allt Wern-ddu within this administrative area.
Geographic features and populated places may cross administrative borders.