- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°53'54"N 3°57'31"W
- Eastings/Northings: 265323, 224028
- OS Grid: SN653240
- Mapcode Local: GBR DX.QJPW
- Mapcode Global: VH4HY.BJHZ
Location and coordinates are for the approximate centre of Dyffryn Tywi within this administrative area.
Geographic features and populated places may cross administrative borders.