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Larne Souterrain is a souterrain of early Christian date located in County Antrim, Northern Ireland. Souterrains are underground stone-built passages and chambers, typically associated with early medieval settlement and activity across Ireland and northern Britain. This example is situated on bedrock composed of Palaeogene extrusive rocks—ancient mafic lavas and tuffs formed during intense volcanic activity in the early Tertiary period. The underlying geology of dark volcanic stone would have presented specific challenges and opportunities for the construction of such a subterranean structure.
The monument lies at grid reference J276809902 in the Larne area, a district with a rich early medieval heritage. The souterrain dates from the early Christian period, when such underground structures served various functions including refuge, storage, or ritual purposes within the settlement landscape. The precise construction and use of this particular example remain subjects of archaeological interest.
The site is protected by the Historic Environment Division under statutory reference 2698, ensuring its preservation as an important record of early Christian settlement practice in northeast Ireland. The souterrain contributes to understanding how early medieval communities adapted their building techniques to local geological conditions and utilised underground space within their domestic and ceremonial landscapes.
Souterrain is a scheduled monument protected by Department for Communities NI under reference 2698. View the official record →
Larne Souterrain is a souterrain of early Christian date located in County Antrim, Northern Ireland. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 2698.
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 2698.
Several scheduled monuments lie within 10 km, including Dunamoy moat. motte (4.8 km), Adam corry, ballycor. medieval church & graveyard (5.8 km), Enclosure (7.3 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.