"A Neolithic portal dolmen marked by over 110 mysterious cupmarks, overlooking the Welsh sea"
Clynnog Fawr Dolmen
Clynnog Fawr, Gwynedd, United Kingdom
On a hillside between mountains and sea near Clynnog Fawr, a Neolithic burial chamber has stood for over five thousand years. Its wedge-shaped capstone bears more than 110 cupmarks—shallow depressions carved by unknown hands for unknown purposes. The dolmen sits within a landscape layered with sacred sites, from the prehistoric to the medieval pilgrimage route to Bardsey Island.
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Quick Facts
Location
Clynnog Fawr, Gwynedd, United Kingdom
Site Type
Coordinates
52.9594, -4.3689
Last Updated
Jan 24, 2026
Learn More
The dolmen was built during the early Neolithic period, when agricultural communities first began creating permanent stone monuments in Wales. It stands within a landscape later claimed by Celtic Christianity.
Origin Story
No origin myth survives from the people who built Bachwen. We know only that sometime between 4200 and 3000 BCE, a community moved these stones into position—four uprights supporting a wedge-shaped capstone—and surrounded them with a cairn of smaller stones. The cairn has since eroded, leaving the skeletal structure exposed.
The cupmarks may tell a story we cannot read. Similar marks appear on dolmens across Wales and beyond, suggesting a shared symbolic vocabulary among Neolithic peoples. Some researchers propose they collected rainwater or marked astronomical events. Others suggest they held meaning within ritual contexts now lost. The honest acknowledgment is that the marks remain mysterious.
Spiritual Lineage
Bachwen belongs to the tradition of portal dolmens—monuments consisting of two tall portal stones at the front, a lower backstone, and a capstone that slopes from front to rear. This architectural form appears throughout Wales, Ireland, and Cornwall during the Neolithic period. The builders shared techniques and possibly beliefs across considerable distances, though without writing, we cannot trace the specific connections.
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