The Preseli Hills or Preseli Mountains (Welsh: Mynydd Y Preseli / Y Preselau - also spelt Presely) (and also recorded as Mynydd Prescelly) are a range of hills in north Pembrokeshire, West Wales. They form part of the Pembrokeshire Coast National Park.
The hills rise to 536 metres above sea level at Foel Cwmcerwyn and are dotted with prehistoric remains, including evidence of Neolithic settlement. In 1923 the petrologist Herbert Henry Thomas identified that bluestone from the hills corresponded to that used to build the inner circle of Stonehenge, and more recent geologists have identified Carn Menyn, sometimes called Carn Meini, as one of the bluestone sources. Others theorise that bluestone from the area was deposited close to Stonehenge by glaciation.
Slate quarrying was once an important industry in the Preseli Hills, and remnants of the quarries can still be seen in Rosebush, Pembrokeshire. There is a workshop at Llangolman where slate is used to make a variety of craft items.
 Sacred and historic sites
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Sacred and historic sites of the Preseli Mountains include:
Carn Menyn Chambered Cairn
Carreg Coetan Arthur
Castell Pen yr Allt
Cerreg Meibion Arthur
Cerreg y Gof
Glandy Cross Complex
Maenllwyd y Rhos
Maen-y-Parc "B" and "C"
Parc Carrig Hirion
Perc y Tywood Maenhir
Rhos fach Standing Stones
The Stone River
St Teilo's Church
Tafarn y Bwlch
Temple Druid Standing Stone
Tre-Fach Standing Stone
Waun Lwyd Stones
Waun Mawn Row or Circle
Waun Mawn Stone
- OS One inch 7th series map sheet 138/151 Fishguard and Pembroke 1965
- Thomas, H.H. 1923. The source of the stones of Stonehenge. Antiquaries Journal 3, 239-260
- Archaeologists Figure Out Mystery of Stonehenge Bluestones
- Thorpe, R.S et al. 1991. The geological sources and transport of the bluestones of Stonehenge, Wiltshire. Proceedings of the Pregistoric Society, 57, 103-57.
- www.geograph.co.uk : photos of the Preseli Hills and surrounding area
- BBC Wales article on the Preseli Hills
- Visit Pembrokeshire website info on the Preseli Hills
- Preseli at The Modern Antiquarian