© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Mynydd Myddfai round cairn is a prehistoric burial monument located in Wales, protected as a scheduled ancient monument by Cadw under reference CM351. The cairn sits on bedrock composed of Pridoli rocks—undifferentiated mudstone, siltstone and sandstone—typical of the geological formations that characterise much of the Welsh uplands. This solid stone base would have provided a stable foundation for the construction of the burial mound, which would have been built by stacking stone rubble to create a prominent earthwork marker across the landscape.
Round cairns of this type typically date to the Bronze Age, though some may be earlier, and served as burial monuments for individuals or small family groups. The construction of such cairns required considerable community labour, reflecting both the status of the deceased and the importance of maintaining visible territorial markers across open moorland. The monument's survival on Mynydd Myddfai, despite centuries of exposure to upland weathering, demonstrates the durability of stone-built prehistoric structures in the Welsh landscape.
Mynydd Myddfai round cairn is a scheduled monument protected by Cadw under reference CM351. View the official record →
Mynydd Myddfai round cairn is a prehistoric burial monument located in Wales, protected as a scheduled ancient monument by Cadw under reference CM351.
Mynydd Myddfai round cairn dates from the prehistoric period, and is classified as a round cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Mynydd Myddfai round cairn is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is CM351.
Several scheduled monuments lie within 10 km, including Carn y Gigfran (7.1 km), Carnau'r Gareg Las (8.6 km), Burnt Mound 500m ESE of Llwyn Wennol (8.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Mynydd Myddfai round cairn's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Mynydd Myddfai round cairn stands on Pridoli Rocks (Undifferentiated), bedrock that formed in the Pridoli. The rock here is mudstone, siltstone and sandstone.