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| Mynydd Preseli | |
|---|---|
| Name | Preseli Hills |
| Other name | Preseli |
| Country | Wales |
| County | Pembrokeshire |
| Highest | Foel Cwmcerwyn |
| Elevation m | 536 |
| Grid ref | SN101347 |
| Topo map | OS Explorer OL36 |
Mynydd Preseli is a range of hills in north Pembrokeshire, Wales, known for its rounded moorland summits, exposed tors, and archaeological prominence. The area combines upland heath, peat plateau, and farmed valleys and has featured in studies linking prehistoric monuments to distant monolith sources. It forms a distinct upland block within Pembrokeshire Coast National Park and lies near communities such as Newport, Pembrokeshire, Crymych, and Nevern.
The Preseli hills occupy a compact upland massif in north Pembrokeshire bordered by the Teifi Valley to the north and the Cleddau catchment to the south. Principal summits include Foel Cwmcerwyn (the highest point of the range), Carn Meini, Foel Drygarn, and Bwlch Cerrig Duon, which form a skyline visible from the Cardigan Bay coast and the Pembrokeshire Coast Path. The landscape features peat bogs, blanket bog, enclosed pasture, and a matrix of minor roads connecting settlements like Haverfordwest and Fishguard. Hydrologically the hills are source areas for tributaries of the River Teifi, River Nevern, and River Nyfer, with upland mires influencing downstream flows that reach estuaries managed under Natural Resources Wales. The Preseli block sits within the geological province that influences regional transport routes including the A487 and rail corridors near Carmarthen.
The hills are underlain principally by a suite of Precambrian and Ordovician igneous and metamorphic rocks, including dolerite outcrops, granites, and rhyolites that form characteristic tors such as at Carn Menyn and Carn Goedog. These outcrops have been linked geochemically to bluestones used in the Stonehenge monument, prompting interdisciplinary research involving petrography, argon–argon dating, and geochemical fingerprinting by teams from institutions like University College London and National Museum Cardiff. Quaternary glacial processes shaped the plateau with glacial till, moraines, and post-glacial peat accumulation; periglacial weathering produced blockfields and tor features comparable to those catalogued across Snowdonia and the Cambrian Mountains.
Upland heath and blanket bog habitats support assemblages typical of Atlantic uplands, including heather stands and bog cotton on peatlands, and provide nesting grounds for birds such as red grouse, hen harrier, and curlew. Mammals recorded in the area include badger, fox, and populations of common pipistrelle bats in wooded valleys. The flora features acid-tolerant species including bilberry and bell heather, with wet flushes supporting Sphagnum mosses and specialised sedges. Conservation agencies such as Natural Resources Wales and NGOs like the Royal Society for the Protection of Birds monitor habitats for designation within Sites of Special Scientific Interest and Special Protection Areas established under frameworks alongside UK and European Union directives pertaining to habitat protection.
The Preseli hills contain a dense record of prehistoric activity, including Neolithic and Bronze Age burial cairns, stone circles, standing stones, and hut sites. Important monuments include cairn fields on Carn Meini and fragments of stone settings around Foel Drygarn and Bedd yr Afanc areas, which have been surveyed by archaeologists from Cardiff University and the Royal Commission on the Ancient and Historical Monuments of Wales. Geological sourcing studies implicating Preseli dolerite as the origin of some Stonehenge bluestones have stimulated research into long-distance transport, megalithic exchange, and ritual landscapes linking the hills to sites across Wales and Wessex. Radiocarbon dates, lithic analyses, and landscape survey continue to refine models of prehistoric land use and monument construction.
Historically the Preseli uplands have been a cultural frontier within Dyfed and later medieval Pembrokeshire lordships, intersecting with routes used by pilgrims to St Davids and markets in Haverfordwest. Folklore recorded by antiquarians references giants, cairn legends, and place-name traditions tied to figures in Welsh mythology and local saints such as St Brynach. The hills have inspired poets and antiquaries, featuring in works and collections held by National Library of Wales and illuminated in fieldwork by scholars from Bangor University. During the post‑medieval period upland commons were subject to enclosure and agricultural improvement contested in parish records archived at Pembrokeshire Archives.
The Preseli area offers hiking, birdwatching, and heritage tourism with routes crossing peatland, tors, and ancient monuments accessible from car parks at Bwlchgwyn and lanes off the A478. Recreational infrastructure includes waymarked trails, permissive paths managed by Pembrokeshire Coast National Park Authority, and long-distance routes linking to the Ceredigion hills and the Pembrokeshire Coast Path National Trail. Outdoor education groups and guided archaeology walks are provided by local trusts and societies such as the Preseli Society and community trusts in villages like Crymych. Access is governed by the Countryside and Rights of Way Act 2000 provisions enacted across open country in Wales.
Landscape-scale management involves statutory designations including Site of Special Scientific Interest notifications, local conservation plans by Natural Resources Wales, and community-led stewardship funded through agri-environment schemes administered by the Welsh Government. Challenges include peat restoration, invasive scrub control, fire prevention, and balancing grazing regimes monitored by commoners and landowners recorded in local grazing associations. Archaeological conservation engages organisations like the Royal Commission on the Ancient and Historical Monuments of Wales to record and protect monuments against erosion and informal ground disturbance. Collaborative projects with academic partners aim to reconcile upland biodiversity goals with cultural heritage conservation and sustainable rural livelihoods.
Category:Hills of Pembrokeshire