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

Monmouthshire Monmouthshire ( cy, Sir Fynwy) is a county in the south-east of Wales. The name derives from the historic county of the same name; the modern county covers the eastern three-fifths of the historic county. The largest town is Abergavenny, with ...

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

. 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 extremely thin elastic plates. This characteristic is described as perfect basal cleavage. Mica is ...

ceous

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...

s of the Brownstones Formation, a unit of the

Old Red Sandstone The Old Red Sandstone 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 northeastern seaboard of North America. It also exte ...

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 invasion of England in 1066, to protect the route from Wales to Hereford. Possibly commis ...

White Castle (Wales) White Castle ( cy, Castell Gwyn), 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 invasion of ...

and

Skenfrith Castle Skenfrith Castle ( cy, Castell Ynysgynwraidd) 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 Wa ...

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