The Clwydian Range (; also Clwydian Hills or Clwyds) is a series of

hill A hill is a landform that extends above the surrounding terrain. It often has a distinct summit, and is usually applied to peaks which are above elevation compared to the relative landmass, though not as prominent as Mountain, mountains. Hills ...

s in the north-east of

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 ...

that runs from Llandegla in the south to Prestatyn in the north; the highest point is Moel Famau. The range forms the north-western part of the Clwydian Range and Dee Valley

Area of Outstanding Natural Beauty An Area of Outstanding Natural Beauty (AONB; , AHNE) is one of 46 areas of countryside in England, Wales, or Northern Ireland that has been designated for conservation due to its significant landscape value. Since 2023, the areas in England an ...

Geology

The Clwydian Hills are formed from an upstanding block of

deep sea The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combination of low tempe ...

sediment Sediment is a solid material that is transported to a new location where it is deposited. It occurs naturally and, through the processes of weathering and erosion, is broken down and subsequently sediment transport, transported by the action of ...

s formed during the

Silurian The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of t ...

period as debris slurries originating on the nearby continental shelf. The older

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

s and

siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeabil ...

s of the Nantglyn Flags Formation form parts of the west-facing scarp slope and the overlying Elwy Formation, which consists of mudstones and siltstones deposited in deep marine conditions with numerous

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 ...

beds, forms most of the higher ground. Both formations are of Ludlovian age. The range's rocks are intensely faulted; the major Vale of Clwyd Fault is responsible for the impressive west-facing scarp of the Clwydian Range. It downthrows the rocks to the west and separates the younger

Carboniferous The Carboniferous ( ) is a Geologic time scale, geologic period and System (stratigraphy), system of the Paleozoic era (geology), era that spans 60 million years, from the end of the Devonian Period Ma (million years ago) to the beginning of the ...

and Permo-Triassic rocks of the Vale of Clwyd from those of the hills. Ice from the Welsh ice-sheet moved eastwards over the Clwydian Hills during the last ice age, impinging on the Irish Sea Ice to the east of the range. Numerous glacial meltwater channels occur around the range whilst the valley of the River Wheeler which cuts the range in two was a significant drainage channel.

Geography

The hills in the Clwydian Range provide extensive views across northern Wales, to the high peaks of

Snowdonia Snowdonia, or Eryri (), is a mountainous region and National parks of the United Kingdom, national park in North Wales. It contains all 15 mountains in Wales Welsh 3000s, over 3000 feet high, including the country's highest, Snowdon (), which i ...

, eastwards across the

Cheshire Plain The Cheshire Plain is a relatively flat expanse of lowland within the county of Cheshire in North West England but extending south into Shropshire. It extends from the Mersey Valley in the north to the Shropshire Hills in the south, bounded by t ...

to the

Peak District The Peak District is an Highland, upland area in central-northern England, at the southern end of the Pennines. Mostly in Derbyshire, it extends into Cheshire, Greater Manchester, Staffordshire, West Yorkshire and South Yorkshire. It is subdivi ...

, and towards

Manchester Manchester () is a city and the metropolitan borough of Greater Manchester, England. It had an estimated population of in . Greater Manchester is the third-most populous metropolitan area in the United Kingdom, with a population of 2.92&nbs ...

and

Liverpool Liverpool is a port City status in the United Kingdom, city and metropolitan borough in Merseyside, England. It is situated on the eastern side of the River Mersey, Mersey Estuary, near the Irish Sea, north-west of London. With a population ...

in England to the northeast. The Offa's Dyke National Trail traverses the range's high ground from Llandegla to Prestatyn. The hills, which are mainly heather-clad upland above pastures, have six

Iron Age The Iron Age () is the final epoch of the three historical Metal Ages, after the Chalcolithic and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory (before recorded history) and progre ...

hillfort A hillfort is a type of fortification, fortified refuge or defended settlement located to exploit a rise in elevation for defensive advantage. They are typical of the late Bronze Age Europe, European Bronze Age and Iron Age Europe, Iron Age. So ...

s including Y Foel ( Moel Hiraddug), Moel-y-gaer, Penycloddiau, Moel Arthur, a second Moel y Gaer and Foel Fenlli. There are several

tumuli A tumulus (: tumuli) is a mound of Soil, earth and Rock (geology), stones raised over a grave or graves. Tumuli are also known as barrows, burial mounds, mounds, howes, or in Siberia and Central Asia as ''kurgans'', and may be found through ...

and

cairn A cairn is a human-made pile (or stack) of stones raised for a purpose, usually as a marker or as a burial mound. The word ''cairn'' comes from the (plural ). Cairns have been and are used for a broad variety of purposes. In prehistory, t ...

s on the hills.

Summits

Area of Outstanding Natural Beauty

The Clwydian Range was designated as an

in 1985, one of only five in Wales. The original area was , but in 2011 the area was extended southwards by a further to include the Dee Valley, Moel y Gamelin, the Horseshoe Pass and Castell Dinas Bran, the towns of

Llangollen Llangollen () is a town and community (Wales), community, situated on the River Dee, Wales, River Dee, in Denbighshire, Wales. Its riverside location forms the edge of the Berwyn range, and the Dee Valley section of the Clwydian Range and Dee Val ...

and Corwen, the

Pontcysyllte Aqueduct The Pontcysyllte Aqueduct (; ) is a navigable aqueduct that carries the Llangollen Canal across the River Dee in the Vale of Llangollen in northeast Wales. The 18-arched stone and cast iron structure is for use by narrowboats and was complet ...

, Chirk Castle and Valle Crucis Abbey. The AONB now extends to . A wide range of wildlife thrives in the range, including

red kite The red kite (''Milvus milvus'') is a bird of prey in the family Accipitridae, which also includes many other Diurnality, diurnal Bird of prey, raptors such as eagles, buzzards, and harrier (bird), harriers. The species currently breeds only i ...

s and

red fox The red fox (''Vulpes vulpes'') is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, plus ...

es, which both prey on rabbits and voles. There is also one of the few Welsh populations of black grouse and there is a project to conserve the European water vole, which is suffering a large decline in numbers across the United Kingdom. Another project is trying to get rid of the non-native Himalayan balsam which has invaded the Alyn Valley area.

Recreation

The

Offa's Dyke Path Offa's Dyke Path () is a long-distance footpath loosely following the Wales–England border. Officially opened on 10 July 1971, by John Hunt, Baron Hunt, Lord Hunt, it is one of Britain's National Trails and draws hillwalking, walkers from th ...

follows the Clwydian Range, although

Offa's Dyke Offa's Dyke () is a large linear Earthworks (Archaeology), earthwork that roughly follows the England–Wales border, border between England and Wales. The structure is named after Offa of Mercia, Offa, the Anglo-Saxons, Anglo-Saxon king of Mer ...

itself was not constructed on it. The Clwydian Way long distance footpath passes through the Clwydian Range, and the North Wales Path follows the foot of the scarp between Prestatyn and Dyserth.

References

External links

Clwydian Range and Dee Valley AONB

Clwydian Range Tourism Group
{{Authority control Areas of Outstanding Natural Beauty in Wales Mountains and hills of Flintshire Mountains and hills of Denbighshire