Cwm Onnau, Powys

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

• Category: Geographic Feature
• Type: Valley

• Latitude/Longitude: 51°50'56"N 3°10'30"W
• Eastings/Northings: 319149, 217371
• OS Grid: SO191173
• Mapcode Local: GBR YZ.TM1Q
• Mapcode Global: VH6CG.XS8C

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