kids encyclopedia robot

Preseli Hills facts for kids

Kids Encyclopedia Facts
Pembrokeshire UK relief location map
Relief map of Pembrokeshire
(inset: outline of Wales. Pembrokeshire shown in red)
Preseli Mountains map
Highest part of range shown within Pembrokeshire Coast National Park
OS old series 1 63360 40
1819 Ordnance Survey map of Pembrokeshire
160412 W Preseli Hills from NE (Tony Holkham)
The western Preselis viewed from the northeast
View from Carn Menyn eastwards towards Foel Drigarn and Y Frenni 2011
View from Carn Menyn eastwards towards Foel Drygarn (centre-left) and Y Frenni (centre-right) in the distance

The Preseli Hills or, as they are known locally and historically, Preseli Mountains (Welsh: Mynyddoedd y Preseli / Y Preselau prə-SEL-ee) is a range of hills in north Pembrokeshire, west Wales, mostly within the Pembrokeshire Coast National Park.

The range stretches from the proximity of Newport in the west to Crymych in the east, some 13 miles (21 km) in extent. The highest point at 1,759 feet (536 m) above sea level is Foel Cwmcerwyn. The ancient 8 miles (13 km) of track along the top of the range is known as the Golden Road.

The Preselis have a diverse ecosystem, many prehistoric sites, and are a popular tourist destination. There are scattered settlements and small villages; the uplands provide extensive unenclosed grazing, and the lower slopes are mainly enclosed pasture.

Slate quarrying was once an important industry. More recently, igneous rock is being extracted. The Preselis have Special Area of Conservation status, and there are three sites of special scientific interest (SSSIs).

Name variations

A peak is spelt Percelye on a 1578 parish map, and more recent maps show the range as Presely or Mynydd Prescelly. The etymology is unknown, but is likely to involve Welsh prys, meaning "wood, bush, copse". A number of other peaks are shown on the 1578 map, but the only other named peak is Wrennyvaur (now Frenni Fawr). An 1819 Ordnance Survey Map refers to the range as Precelly Mountain (singular). An 1833 publication stated: the ancient Welsh Preswylva, signifying "a place of residence", but does not cite any evidence.


The hills are formed largely from the Ordovician age marine mudstones and siltstones of the Penmaen Dewi Shales and Aber Mawr Shale formations which have been intruded by microgabbro (otherwise known as dolerite or diabase) of Ordovician age. The former slate quarries at Rosebush on the southern edge of the hills worked the Aber Mawr Formation rocks whilst it is the dolerite tors of Carnmenyn which have been postulated, amongst other localities, as the source of the Stonehenge ‘bluestones’. In contrast Foel Drygarn towards the eastern end of the range is formed from tuffs and lavas of the Fishguard Volcanic Group. Further east is Frenni Fawr which is formed from mudstones and sandstones of the Nantmel Mudstone Formation of late Ordovician Ashgill age. The sedimentary rocks dip generally northwards and are cut by numerous geological faults. Cwm Gwaun is a major glacial meltwater channel which divides the northern tops such as Mynydd Carningli from the main mass of the hills.


The hills, much of which are unenclosed moorland or low-grade grazing with areas of bog, are surrounded by farmland and active or deserted farms. Field boundaries tend to be earth banks topped with fencing and stock-resistant plants such as gorse. Rosebush Reservoir, one of only two reservoirs in Pembrokeshire, supplies water to southern Pembrokeshire and is a brown trout fishery located on the southern slopes of the range near the village of Rosebush. To the south is Llys y Fran reservoir. There are no natural lakes in the hills, but a number of rivers, including the Gwaun, Nevern, Syfynwy and Tâf have their sources in the range.


The principal peak at 1,759 feet (536 m) above sea level is Foel Cwmcerwyn. There are 14 other peaks over 980 feet (300 m) of which three exceed 1,300 feet (400 m).

Peak Height Image Notes
Foel Cwmcerwyn 536 m (1,759 ft)
Moorland with view of Foel Cwmcerwyn - - 1447660.jpg
Highest peak; cairns; disused quarry
Cerrig Lladron 468 m (1,535 ft)
Fagwyr Goch and Cerrig Lladron - - 640997.jpg
Bronze Age stone row
Foel Feddau 467 m (1,532 ft)
Foel Feddau - - 1433497.jpg
Carn Siân 402 m (1,319 ft)
Carn Siân, Preseli Mountains - - 259497.jpg
Frenni Fawr 395 m (1,296 ft)
Frenni Fawr from the southeast - - 191718.jpg
Tumuli; see also Blaenffos
Mynydd Bach 374 m (1,227 ft)
Mynydd Bach trig - - 246835.jpg
Stone circle, standing stone, tumulus
Foel Dyrch 368 m (1,207 ft)
Ruins on the south side of Foel Dyrch - - 1026506.jpg
Carn Menyn 365 m (1,198 ft)
Carn Menyn from Eglwyswrw - - 1435904.jpg
Bluestones (on the far ridge)
Foel Drygarn 363 m (1,191 ft)
Foel Drygarn 527375.jpg
Hill fort (English: three cairns)
Crugiau Dwy 359 m (1,178 ft)
Television mast, Gwarllwyn Wood - - 527384.jpg
Preseli transmitting station
Mynydd Carningli 347 m (1,138 ft)
Carn Ingli from Newport Beach - - 296538.jpg
Mynydd Castlebythe 347 m (1,138 ft)
June in Wales - - 455244.jpg
Waun Mawn 339 m (1,112 ft)
Standing stone and lying stone near Cnwc yr Hydd - - 4213876.jpg
Mynydd Cilciffeth 335 m (1,099 ft)
Heather in the grazings on Mynydd Cilciffeth - - 628512.jpg
Mynydd Melyn 307 m (1,007 ft)
Prehistoric hut circles on the flank of Mynydd Melyn - - 199943.jpg


Villages and other settlements within the range include Blaenffos, Brynberian, Crosswell, Crymych, Cwm Gwaun, Dinas Cross, Glandy Cross, Mynachlog-ddu, New Inn, Pentre Galar, Puncheston, Maenclochog, Rosebush and Tafarn-y-Bwlch. The only town in the Preseli area is Newport, at the foot of the Carningli-Dinas upland in the northwest of the range.

Natural history and land use

The Preselis provide hill grazing for much of the year and there is some forestry. As well as features of interest to geologists and archaeologists, the hills have a wide variety of bird, insect and plant life. There are three sites of special scientific interest (SSSIs): Carn Ingli and Waun Fawr (biological), and Cwm Dewi (geological). The Preseli transmitting station mast, erected in 1962, stands on Crugiau Dwy near the hamlet of Pentre Galar. To the south of Crugiau Dwy is the extensively quarried hill Carn Wen (Garnwen Quarry) which was still actively extracting igneous rock in 2018.

The Preselis have Special Area of Conservation status; the citation states that the area is "... exceptional in Wales for the combination of upland and lowland features...". Numerous scarce plant and insect species exist in the hills. For example, they are an important UK site for the rare Southern damselfly, Coenagrion mercuriale, where efforts to restore habitat were underway in 2015 and reported in 2020 to have been a success.

Communications and access

One major road, the A478, crosses the eastern end of the range, reaching a height of 248 metres (814 ft). Two B-class roads, intersecting at New Inn, cross the hills: the B4313 NW-SE, reaching 278 metres (912 ft) and the B4329 NE-SW, reaching 404 metres (1,325 ft) at Bwlch-Gwynt (translation: windy gap). These, and a number of other minor roads and lanes, provide scenic routes popular with motoring, cycling and walking tourists. The A487 road skirts the western end of the range, near Newport. Cattle grids prevent egress of grazing stock from unenclosed areas of the hills.

The hills are popular with walkers wishing to follow prehistoric trails, with walks varying from easy to long-distance. The larger part of the hills is designated under the Countryside and Rights of Way Act 2000 as 'open country' thereby enabling walkers the 'freedom to roam' across unenclosed land, subject to certain restrictions. An east-west bridleway which runs the length of the main massif (known as Flemings' Way or the Golden Road), together with spurs to north and south, gives access to mountain bikers and horseriders. There are cycle trails. Paragliding is not permitted without the consent of the land owners, who in 2014 collectively agreed not to allow it.

Other features

Castell Henllys - - 67364
Castell Henllys reconstructed Iron Age fort

Castell Henllys, on the A487 road between Eglwyswrw and Felindre Farchog is a reconstructed Iron Age settlement, illustrating what life may have been like in those times.


The Preselis are dotted with prehistoric remains, including evidence of Neolithic settlement. More were revealed in an aerial survey during the 2018 heatwave.

Samuel Lewis's A Topographical Dictionary of Wales published in 1833 said of Maenclochog parish:

Part of the Precelly mountain, which is the highest in South Wales... the ancient Welsh name of this mountain is Preswylva, signifying "a place of residence," and is derived from its having been the resort of the natives, as a place of security, in the intestine [sic] wars by which this part of the principality was agitated during the earlier periods of its history. This mountain was anciently well clothed with forest timber, affording shelter to such as took refuge in its recesses, but now presents a bare and sterile aspect, dreary in its appearance, and exhibiting some small vestiges of ancient encampments, which were probably those constructed by the natives.

Pollen analysis suggests that the hills were once forested but the forests had been cleared by the late Bronze Age.


Carn Menyn bluestones - - 1451509
Carn Menyn bluestones

In 1923 the petrologist Herbert Henry Thomas proposed that bluestone from the hills corresponded to that used to build the inner circle of Stonehenge, and later geologists suggested that Carn Menyn (formerly called Carn Meini) was one of the bluestone sources. Recent geological work has shown this theory to be incorrect. It is now thought that the bluestones at Stonehenge and fragments of bluestone found in the Stonehenge "debitage" have come from multiple sources on the northern flanks of the hills, such as at Craig Rhos-y-felin. Advanced details of a recent contribution to the puzzle of the precise origin of the Stonehenge bluestones were published by the BBC in November 2013.

Others theorise that bluestone from the area was deposited close to Stonehenge by glaciation. More detailed discussions on the bluestone topic can be found in the Stonehenge, Theories about Stonehenge and Carn Menyn articles.

Further investigations have pointed to a link between Waun Mawn (see below) and the Stonehenge bluestones.

Individual sites

Beddarthur standing stone circle, Preseli Mountains - - 258436
Bedd Arthur standing stones
Carreg Coetan burial chamber. - - 1044642
Carreg Coetan burial chamber
Cerrog Lladron Standing Stone H3a
Cerrig Lladron standing stone

The hills are rich in sacred and prehistoric sites, many of which are marked on Ordnance Survey maps. They include burial chambers, tumuli, hill forts, hut circles, stone circles, henges, standing stones and other prehistoric remains. These sites are spread across a number of communities that share parts of the Preseli range. In 2010, Dyfed Archaeological Trust carried out a comprehensive survey of historic sites in the Preseli Hills for Cadw. The Trust has produced extensive notes on the mountain range and surrounding features and villages.

Some of the more notable are -

Others include -

  • Banc Du (evidence of prehistoric settlement)
  • Carn Alw (Neolithic settlement)
  • Carn Goedog (bluestones and standing stone)
  • Cerrig Lladron (Bronze Age stone row)
  • Foel Drygarn (hillfort)
  • Foel Cwmcerwyn (tumuli)
  • Frenni Fach & Frenni Fawr (tumuli - see also Blaenffos)
  • Glandy Cross (prehistoric remains)
  • Glyn Gath (tumulus)
  • Gors Fawr (stone circle)
  • Mynyedd Melyn (hut circle)
  • Parc-y-Meirw (standing stones)
  • Rhos fach (standing stones)
  • Tafarn y Bwlch (mountain pass and standing stones)
  • Tre-Fach (standing stone, prehistoric camp)
  • Ty-Meini (standing stone, known as "The Lady Stone")
  • Waun Mawn (standing stones; dismantled stone circle c.3400-3000 BC) Grid reference


Slate quarrying was once an important industry in the Preseli Hills; the former quarries, worked for much of the 19th century, can still be seen in a number of locations such as Rosebush. Preseli slate was not of roofing quality, but its density made it ideal for machining for building and crafts. Most quarries had closed by the 1930s but there is a workshop at Llangolman where slate is still used to make a variety of craft items.

During the Second World War, the War Office used the Preseli Hills extensively for training exercises by British and American air and ground forces. Its proposed continued use after the war was the subject of a two-year ultimately successful protest by local leaders. The success of the protest was commemorated 60 years on, in 2009, with a plaque at each end of the Golden Road: one at the foot of Foel Drygarn near Mynachlog-ddu, and the other near the B4329 at Bwlch y Gwynt.

In 2000 Terry Breverton, a lecturer at Cardiff University, in promoting a book he had published, suggested that the rock star Elvis Presley's ancestors came from the Preseli Hills and may have had links to a chapel at St Elvis.

Women's History Month on Kiddle
Women Scientists of Antiquity
Mary the Jewess
kids search engine
Preseli Hills Facts for Kids. Kiddle Encyclopedia.