- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 52°59'43"N 4°17'42"W
- Eastings/Northings: 246065, 346701
- OS Grid: SH460467
- Mapcode Local: GBR 5H.H73Z
- Mapcode Global: WH440.0Y0Y
Location and coordinates are for the approximate centre of Bwlch-derwin within this administrative area.
Geographic features and populated places may cross administrative borders.