- Category: Landcover
- Type: Forest or Wood
- Latitude/Longitude: 52°4'32"N 4°1'8"W
- Eastings/Northings: 261731, 243834
- OS Grid: SN617438
- Mapcode Local: GBR DV.CFR1
- Mapcode Global: VH4H4.9355
Location and coordinates are for the approximate centre of Allt y Derwlwyn within this administrative area.
Geographic features and populated places may cross administrative borders.