- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 51°49'10"N 3°7'7"W
- Eastings/Northings: 322980, 214043
- OS Grid: SO229140
- Mapcode Local: GBR F1.WH0X
- Mapcode Global: VH6CP.WJKC
Location and coordinates are for the approximate centre of Cwm Siôn Mathew within this administrative area.
Geographic features and populated places may cross administrative borders.