© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Castell Garw is a prehistoric henge monument situated in Wales. The site sits upon bedrock of Arenig Rocks, Undifferentiated, comprising mudstone, siltstone and sandstone deposits laid down during the Arenigian period. This geological foundation is typical of mid-Wales upland terrain, where such resistant stone formations provided ancient communities with substantial building materials. The henge is protected as a scheduled monument by Cadw, the Welsh heritage organisation, under reference CM245.
Henges are among Britain's most significant Neolithic and Bronze Age ritual monuments, characterised by circular earthworks comprising banks and ditches. Castell Garw exemplifies this monumental tradition, which flourished across the British Isles during periods of increased social complexity and ceremonial practice. The monument's location in Wales reflects the wide distribution of such ceremonial centres across upland and lowland regions alike.
The preservation of Castell Garw under state protection acknowledges its archaeological and cultural significance. Like other henges, the site likely served multiple purposes within prehistoric society—whether as a focus for seasonal gatherings, ritual activities or astronomical observations. The monument survives as a tangible record of Neolithic and Bronze Age settlement patterns and social organisation across Wales, contributing substantially to our understanding of prehistoric ritual practice in Britain.
Castell Garw is a scheduled monument protected by Cadw under reference CM245. View the official record →
Castell Garw is a prehistoric henge monument situated in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CM245.
Castell Garw dates from the prehistoric period, and is classified as a henge. It is one of over 32,000 scheduled monuments protected across the UK.
Castell Garw 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 CM245.
Several scheduled monuments lie within 10 km, including Crugiau Round Barrows (6.8 km), Gelli Diogyn Hillfort (7.5 km), Inscribed Stone N of Parciau Farmhouse (7.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Castell Garw'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.
Castell Garw stands on Arenig Rocks (Undifferentiated), bedrock that formed in the Arenigian. The rock here is mudstone, siltstone and sandstone.