Beacon Hill is the highest hill in eastern Monmouthshire

Monmouthshire

Monmouthshire is a county in south east Wales. The name derives from the historic county of Monmouthshire which covered a much larger area. The largest town is Abergavenny. There are many castles in Monmouthshire .-Historic county:...

, South Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. It is located 0.6 mile (0.965604 km) due east of the village of Trellech

Trellech

Trellech is a village in Monmouthshire, south-east Wales, near Monmouth and the location of an archaeological site. The village is designated as a Conservation Area....

, and 1 miles (1.6 km) north-west of Llandogo

Llandogo

Llandogo is a small village in Monmouthshire, south Wales, located between Monmouth and Chepstow in the lower reaches of the Wye Valley AONB, two miles north of Tintern. It is set on a steep hillside overlooking the River Wye and across into the Forest of Dean in Gloucestershire, England.- History...

. Its crowning point at 306m / 1006ft above sea level is marked by an Ordnance Survey

Ordnance Survey

Ordnance Survey , an executive agency and non-ministerial government department of the Government of the United Kingdom, is the national mapping agency for Great Britain, producing maps of Great Britain , and one of the world's largest producers of maps.The name reflects its creation together with...

 triangulation pillar. The summit, eastern slopes and uppermost western slopes are owned by the Forestry Commission

Forestry Commission

The Forestry Commission is a non-ministerial government department responsible for forestry in Great Britain. Its mission is to protect and expand Britain's forests and woodlands and increase their value to society and the environment....

 which manages the area not only for timber production but for recreation also.

Geology

The summit of the hill is formed from the Quartz Conglomerate Group which is assigned by geologists to the Upper Old Red Sandstone

Old Red Sandstone

The Old Red Sandstone is a British rock formation of considerable importance to early paleontology. For convenience the short version of the term, 'ORS' is often used in literature on the subject.-Sedimentology:...

 - a sequence of sedimentary rock

Sedimentary rock

Sedimentary rock are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles to settle and accumulate or minerals to precipitate from a solution....

s laid down during the late Devonian period. This pebbly sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

 occurs in an outcrop

Outcrop

An outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. -Features:Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by a mantle of soil and vegetation and cannot be...

 through eastern Monmouthshire and neighbouring Gloucestershire

Gloucestershire

Gloucestershire is a county in South West England. The county comprises part of the Cotswold Hills, part of the flat fertile valley of the River Severn, and the entire Forest of Dean....

 and caps other hills of local significance.

Access

All Forestry Commission land is dedicated as access land under the Countryside and Rights of Way Act 2000

Countryside and Rights of Way Act 2000

The Countryside and Rights of Way Act 2000 is a UK Act of Parliament which came into force on 30 November 2000.As of September 2007, not all sections of the Countryside and Rights of Way Act have yet come into force...

and is thus freely available to those on foot. Numerous forest tracks cross the hill's slopes. A car park has been provided on the western side and information panels installed at the site to assist visitors to interpret the extensive views from breaks in the woodland cover.