- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°17'17"N 3°11'29"W
- Eastings/Northings: 318833, 266227
- OS Grid: SO188662
- Mapcode Local: GBR 9Y.XWG0
- Mapcode Global: VH69B.MRP7
Location and coordinates are for the approximate centre of Cwm y Gerwyn within this administrative area.
Geographic features and populated places may cross administrative borders.