© Mapbox · © OpenStreetMap contributors · Boundary data © DfC Northern Ireland (NISMR)
Souterrain — a e.christ. is an early Christian underground stone-built passage located in Antrim, Northern Ireland. The monument sits on bedrock formed from Palaeogene extrusive rocks, comprising mafic lava and mafic tuff that would have presented challenging conditions for excavation. Protected by the Historic Environment Division under reference 3490, the site represents an important example of the souterrain tradition that flourished across the north of Ireland during the early medieval period.
Souterrains were subterranean stone structures created by communities for purposes that remain partially enigmatic—whether as refuges, storage facilities, or ceremonial spaces. Their construction required considerable labour and engineering skill, involving the excavation and stone-lining of passages sometimes extending several metres underground. The volcanic bedrock underlying this particular example would have required careful planning and substantial effort to tunnel through effectively.
The survival of this souterrain demonstrates the durability of early Christian stone construction techniques. Examples of this type are distributed throughout Antrim and the wider Irish landscape, typically dating between the fourth and twelfth centuries. The monument's protected status reflects its significance as evidence of early medieval settlement patterns and the technological capabilities of communities in the region during this formative period of Irish history.
Souterrain is a scheduled monument protected by Department for Communities NI under reference 3490. View the official record →
Souterrain — a e.christ. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 3490.
Souterrain dates from the e.christ. period, and is classified as a souterrain. It is one of over 32,000 scheduled monuments protected across the UK.
Souterrain is a Scheduled Ancient Monument, legally protected by DfC Northern Ireland (NISMR) — the body responsible for designating and safeguarding heritage sites in Ni. The official designation reference is 3490.
Several scheduled monuments lie within 10 km, including Standing stone (8.4 km), Barrow (8.5 km), Mound - burial mound? (8.6 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Souterrain'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.
Souterrain stands on Unnamed Extrusive Rocks, Palaeogene, bedrock that formed in the Paleogene. The rock here is mafic lava and mafic tuff.