The Clwydian Range ( cy, Bryniau Clwyd; also known as the Clwydian Hills; or simply the Clwyds) is a series of

hill A hill is a landform that extends above the surrounding terrain. It often has a distinct summit. Terminology The distinction between a hill and a mountain is unclear and largely subjective, but a hill is universally considered to be not a ...

s in the

north-east The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography. A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each sep ...

Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...

that runs from Llandegla in the south to

Prestatyn Prestatyn is a seaside town and community in Denbighshire, Wales. Historically a part of Flintshire, it is located on the Irish Sea coast, to the east of Rhyl. Prestatyn has a population of 19,085, History Prehistory There is evidence that ...

in the north, the highest point being the popular Moel Famau. The range forms part of the

Clwydian Range and Dee Valley , iucn_category =V , iucn_ref = , photo =Sunny Hillside, Frosty Valley Dee Valley Wales (11014647076).jpg , photo_width = , photo_alt =Image of the view of the Dee Valley from Moel Y Gamelin , photo_caption = ...

Area of Outstanding Natural Beauty An Area of Outstanding Natural Beauty (AONB; , AHNE) is an area of countryside in England, Wales, and Northern Ireland, that has been designated for conservation due to its significant landscape value. Areas are designated in recognition of ...

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 200 metres (656 feet) or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combin ...

sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand ...

s formed during the

Silurian The Silurian ( ) is a geologic period and system spanning 24.6 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 shortest period of the Paleoz ...

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 (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology.' ...

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.Blatt ''et al.'' 1980, ...

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 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 silicat ...

beds, forms most of the higher ground. Both formations are of

Ludlovian The Ludlow Group are geologic formations deposited during the Ludlow epoch of the Silurian period in the British Isles, in areas of England, Ireland, Scotland, and Wales. Formations This group contains the following formations in descending o ...

age. The range's rocks are intensely faulted; the major Vale of Clwyd Fault is responsible for the impressive west-facing

scarp Scarp may refer to: Landforms and geology * Cliff, a significant vertical, or near vertical, rock exposure * Escarpment, a steep slope or long rock that occurs from erosion or faulting and separates two relatively level areas of differing elevatio ...

of the Clwydian Range. It downthrows the rocks to the west and separates the younger

Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferou ...

and Permo-Triassic rocks of the

Vale of Clwyd The Vale of Clwyd ( cy, Dyffryn Clwyd) is a tract of low-lying ground in the county of Denbighshire in north-east Wales. The Vale extends south-southwestwards from the coast of the Irish Sea for some 20 miles (about 30 km) forming a triangl ...

from those of the hills. Ice from the Welsh

ice-sheet In glaciology, an ice sheet, also known as a continental glacier, is a mass of glacial ice that covers surrounding terrain and is greater than . The only current ice sheets are in Antarctica and Greenland; during the Last Glacial Period at La ...

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 channel A meltwater channel (or sometimes a glacial meltwater channel) is a channel cut into ice, bedrock or unconsolidated deposits by the flow of water derived from the melting of a glacier or ice-sheet. The channel may form on the surface of, within ...

s occur around the range whilst the valley of the

River Wheeler The River Wheeler (Welsh: ''Afon Chwiler'') is a tributary of the River Clwyd in north-east Wales. Rising on the east side of the Clwydian Range, it is a "misfit stream" occupying a deep valley cutting westwards through the range into the Vale ...

which cuts the range in two was a significant drainage channel.

The hills

The summits of 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 in northwestern Wales and a national park of in area. It was the first to be designated of the three national parks in Wales, in 1951. Name and extent It was a commonly held belief that the na ...

, 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 b ...

to the

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

, and towards

Manchester Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The ...

and

Liverpool Liverpool is a City status in the United Kingdom, city and metropolitan borough in Merseyside, England. With a population of in 2019, it is the List of English districts by population, 10th largest English district by population and its E ...

in England to the northeast. They have heather-clad summits above rolling pastures. The Offa's Dyke National Trail traverses the range from Llandegla to

. The range includes a number of hills possessing

Iron Age The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age ( Paleolithic, Mesolithic, Neolithic) and the Bronze Age ( Chalcolithic). The concept has been mostly ...

hillfort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...

s, including (from the north) Y Foel (

Moel Hiraddug Moel Hiraddug, also known as Y Foel, is a hill fort and hill in the Clwydian Range of north-east Wales. The northern part of the hill has been eaten away by limestone quarrying. An Iron Age hillfort crowns the hill, called Moel Hiraddug. Its ridge ...

), Moel-y-gaer,

Penycloddiau Penycloddiau is a hill in Flintshire, Wales, and one of five Marilyns in the Clwydian Range. The hill, like Foel Fenlli and Moel Arthur to the south, has an Iron Age hillfort at its summit. It covers making it one of the largest hillforts i ...

, Moel Arthur, a second Moel y Gaer and

Foel Fenlli Foel Fenlli or Moel Fenlli is a hill in Denbighshire, North Wales. With a summit at an elevation of , it is the second highest peak of the Clwydian Range. A popular ascent leads south from the car park at Bwlch Penbarras, which is also a popula ...

. There are, as with many places in the west of Britain, legends associated with

King Arthur King Arthur ( cy, Brenin Arthur, kw, Arthur Gernow, br, Roue Arzhur) is a legendary king of Britain, and a central figure in the medieval literary tradition known as the Matter of Britain. In the earliest traditions, Arthur appears as ...

surrounding these hills. There are several

tumuli A tumulus (plural tumuli) is a mound of earth and stones raised over a grave or graves. Tumuli are also known as barrows, burial mounds or ''kurgans'', and may be found throughout much of the world. A cairn, which is a mound of stones built ...

and

cairn A cairn is a man-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 gd, càrn (plural ). Cairns have been and are used for a broad variety of purposes. In prehi ...

s on the hills.

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 The Horseshoe Pass ( cy, Bwlch yr Oernant, "Pass of the Cold Stream") is a mountain pass in Denbighshire, north-east Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Iri ...

and Castell Dinas Bran, the towns of

Llangollen Llangollen () is a town and community, situated on the 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 Valley Area of Outstanding Natural Bea ...

and

Corwen Corwen is a town and community in the county of Denbighshire in Wales. Historically, Corwen is part of the county of Merionethshire. Corwen stands on the banks of the River Dee beneath the Berwyn mountains. The town is situated west of Llango ...

, the Pontcysyllte Aqueduct,

Chirk Castle Chirk Castle ( cy, Castell y Waun) is a Grade I listed castle located in Chirk, Wrexham County Borough, Wales. History The castle was built in 1295 by Roger Mortimer de Chirk, uncle of Roger Mortimer, 1st Earl of March as part of King Ed ...

and Valle Crucis Abbey. The AONB now extends to .

Wildlife

A wide range of wildlife thrives in the range, including red kites 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 (biology), order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe ...

es, which both prey on rabbits and voles. There is also one of the few Welsh populations of

black grouse The black grouse (''Lyrurus tetrix''), also known as northern black grouse, Eurasian black grouse, blackgame or blackcock, is a large game bird in the grouse family. It is a sedentary species, spanning across the Palearctic in moorland and step ...

and there is a project to conserve the

European water vole The European water vole or northern water vole (''Arvicola amphibius''), is a semi-aquatic rodent. It is often informally called the water rat, though it only superficially resembles a true rat. Water voles have rounder noses than rats, deep br ...

, 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 ''Impatiens glandulifera'', Himalayan balsam, is a large annual plant native to the Himalayas. Via human introduction it is now present across much of the Northern Hemisphere and is considered an invasive species in many areas. Uprooting or cutt ...

which has invaded the Alyn Valley area.

Recreation

The

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

follows the Clwydian Range, although

Offa's Dyke Offa's Dyke ( cy, Clawdd Offa) is a large linear earthwork that roughly follows the border between England and Wales. The structure is named after Offa, the Anglo-Saxon king of Mercia from AD 757 until 796, who is traditionally believed to ha ...

itself was not constructed on it. The Clwydian Way

long distance footpath A long-distance trail (or long-distance footpath, track, way, greenway) is a longer recreational trail mainly through rural areas used for hiking, backpacking, cycling, horse riding or cross-country skiing. They exist on all continents exc ...

passes through the Clwydian Range, and the North Wales Path follows the foot of the scarp between

and

Dyserth Dyserth ( cy, Diserth) is a village, community and electoral ward in Denbighshire, Wales. Its population at the 2011 United Kingdom census was 2,269 and was estimated by the Office for National Statistics as 2,271 in 2019. It lies within the ...

Summits

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