- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°0'52"N 4°8'28"W
- Eastings/Northings: 256456, 348525
- OS Grid: SH564485
- Mapcode Local: GBR 5P.G2HY
- Mapcode Global: WH556.CH76
Location and coordinates are for the approximate centre of Cwm Meillionen within this administrative area.
Geographic features and populated places may cross administrative borders.