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Cookstown Souterrain is an early Christian underground stone-lined passage, located near Cookstown in County Tyrone, Northern Ireland. Souterrains are characteristic features of the early medieval Irish landscape, typically constructed between the 1st and 8th centuries as defensive or storage structures associated with farmsteads and settlements. This example lies on bedrock formed from Palaeogene mafic lavas and tuffs, volcanic rocks that underlie much of the north-central Irish landscape.
The monument sits at grid reference H9335074830 and represents a significant archaeological survival from the period when such passages were dug into hillsides or constructed from stone in low-lying terrain. The construction would have exploited the underlying volcanic geology to create a stone-lined chamber, accessed via a narrow passage. The techniques used—dry stone or clay-bonded walls supporting stone lintels—were designed to withstand subsidence in the unstable ground conditions typical of areas built on basaltic bedrock.
Cookstown Souterrain is protected as a scheduled monument by the Historic Environment Division under reference 15128, ensuring its preservation as evidence of early Christian settlement patterns and construction practices in early medieval Ulster. Such structures offer invaluable insights into domestic life, defence strategies, and engineering knowledge during a formative period of Irish history.
Souterrain is a scheduled monument protected by Department for Communities NI under reference 15128. View the official record →
Cookstown Souterrain is an early Christian underground stone-lined passage, located near Cookstown in County Tyrone, Northern Ireland. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 15128.
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 15128.
Several scheduled monuments lie within 10 km, including C18th windmill - ihr 04690 (2.7 km), Honeymug stone. standing stone (5.8 km), Cloghtogle. portal tomb (6.3 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.