Graig Syfyrddin or just ''The Graig'', is a 423m high hill near Grosmont in north-eastern

Monmouthshire Monmouthshire ( ; ) is a Principal areas of Wales, county in the South East Wales, south east of Wales. It borders Powys to the north; the English counties of Herefordshire and Gloucestershire to the north and east; the Severn Estuary to the s ...

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

. The summit knoll is known as ''Edmund's Tump''. The hill consists of an isolated mass of the

mica Micas ( ) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into fragile elastic plates. This characteristic is described as ''perfect basal cleavage''. Mica is co ...

ceous

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

s of the Brownstones Formation, a unit of the

Old Red Sandstone Old Red Sandstone, abbreviated ORS, is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the eastern seaboard of North America. It ...

well known from the nearby Black Mountains, of which it can be considered an outlier in both the geographical and geological sense. The Three Castles Walk, a waymarked recreational walk in Monmouthshire linking

Grosmont Castle Grosmont Castle is a ruined castle in the village of Grosmont, Monmouthshire, Wales. The fortification was established by the Normans in the wake of the Norman conquest of England, invasion of England in 1066, to protect the route from Wales to ...

White Castle (Wales) White Castle (), also known historically as Llantilio Castle, is a ruined castle near the village of Llantilio Crossenny in Monmouthshire, Wales. The fortification was established by the Normans in the wake of the Norman conquest of England, i ...

and

Skenfrith Castle Skenfrith Castle () is a ruined castle in the village of Skenfrith in Monmouthshire, Wales. The fortification was established by the Normans in the wake of the invasion of England in 1066, to protect the route from Wales to Hereford. Possibly ...

passes over the hill.

References

External links

www.geograph.co.uk : photos of Graig Syfyrddin and surrounding area
Marilyns of Wales Mountains and hills of Monmouthshire {{Monmouthshire-geo-stub