Cwm y Derw, Powys

• Parish/Community: Trefeglwys
• Unitary Authority: Powys
• Region: Wales

• Category: Geographic Feature
• Type: Valley

• Latitude/Longitude: 52°29'54"N 3°40'28"W
• Eastings/Northings: 286418, 290276
• OS Grid: SN864902
• Mapcode Local: GBR 99.HPY4
• Mapcode Global: VH5BN.8G7H

Location and coordinates are for the approximate centre of Cwm y Derw within this administrative area. Geographic features and populated places may cross administrative borders.