- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°51'22"N 3°24'15"W
- Eastings/Northings: 305539, 329664
- OS Grid: SJ055296
- Mapcode Local: GBR 6N.S1K2
- Mapcode Global: WH78L.PG2Q
Location and coordinates are for the approximate centre of Cwm Llwyd-mawr within this administrative area.
Geographic features and populated places may cross administrative borders.