- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 52°23'27"N 3°41'42"W
- Eastings/Northings: 284746, 278360
- OS Grid: SN847783
- Mapcode Local: GBR 98.QJVT
- Mapcode Global: VH5C6.W5X9
Location and coordinates are for the approximate centre of Mynydd y Defaid within this administrative area.
Geographic features and populated places may cross administrative borders.