- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°5'0"N 4°18'8"W
- Eastings/Northings: 245884, 356515
- OS Grid: SH458565
- Mapcode Local: GBR 5G.9RBV
- Mapcode Global: WH43L.WRCD
Location and coordinates are for the approximate centre of Glyn-Irwch within this administrative area.
Geographic features and populated places may cross administrative borders.