| Graig Syfyrddin | |
|---|---|
 Graig Syfyrddin viewed from the west | |
| Highest point | |
| Elevation | 423 m (1,388 ft) |
| Prominence | 235 m (771 ft) |
| Parent peak | Ysgyryd Fawr |
| Listing | Marilyn |
| Geography | |
| Location | Monmouthshire, Wales |
| Parent range | Brecon Beacons |
| OS grid | SO403210 |
Graig Syfyrddin or just The Graig, is a 423m high hill near Grosmont in north-eastern Monmouthshire, Wales. The summit knoll is known as Edmund's Tump. The hill consists of an isolated mass of the micaceous sandstones of the Brownstones Formation, a unit of the Old Red Sandstone well known from the nearby Black Mountains, of which it can be considered an outlier in both the geographical and geological sense.[1]
The Three Castles Walk,[2] a waymarked recreational walk in Monmouthshire linking Grosmont Castle, White Castle (Wales) and Skenfrith Castle passes over the hill.