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Nant y Gro round cairns is a prehistoric round cairn located in Wales and protected by Cadw under reference BR375. Round cairns of this type were constructed during the Bronze Age as burial monuments, typically containing inhumation or cremation deposits within stone-built chambers or cists. The cairn's construction would have involved the accumulation of stone gathered from the surrounding landscape, creating a distinctive mounded structure visible across considerable distances and serving as an enduring territorial marker for the Bronze Age community that built it.
The monument sits upon bedrock composed of Ashgill Rocks, undifferentiated mudstone, siltstone and sandstone formed during the Ordovician period. This geology influenced both the available building stone and the landscape's character, with the softer sedimentary rocks creating the upland terrain typical of Welsh Bronze Age settlement zones. The choice of this location reflects the prehistoric preference for elevated positions commanding views across surrounding valleys and ridges.
Today the cairn survives as a visible landscape feature, preserving evidence of Bronze Age funerary practice and social organisation. Such monuments are vital archaeological resources, providing information about prehistoric burial customs, land use and the ritual landscape of ancient Wales. The site's protection ensures its preservation for future study and public appreciation of Wales's prehistoric heritage.
Nant y Gro round cairns is a scheduled monument protected by Cadw under reference BR375. View the official record →
Nant y Gro round cairns is a prehistoric round cairn located in Wales and protected by Cadw under reference BR375.
Nant y Gro round cairns 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.
Nant y Gro round cairns 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 BR375.
Several scheduled monuments lie within 10 km, including Gorllwyn round cairns (3.9 km), Carn Pantmaenllwyd cairn (4.4 km), Gurnos ring cairn (4.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Nant y Gro round cairns'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.
Nant y Gro round cairns stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.