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Mound & possible souterrain at Castlereagh is an Early Christian earthwork situated on Sherwood Sandstone bedrock in County Down, Northern Ireland. The underlying geology of sandstone, siltstone and mudstone has influenced both the monument's preservation and the feasibility of any underground features. The mound itself represents a form of settlement or ceremonial focus typical of the Early Christian period in Ulster, when such earthen structures served defensive, residential or ritual purposes across the province.
The possible souterrain—an underground stone-lined passage—suggests this was a site of some significance during the Early Christian era. Such subterranean chambers were constructed beneath or near domestic structures, serving functions ranging from storage to refuge. The Sherwood Sandstone bedrock would have presented both opportunities and constraints for tunnelling; whilst the material is relatively soft and workable, the damp conditions prevalent in this region of Ireland would have required careful drainage considerations.
The monument is protected as a scheduled historic monument by the Historic Environment Division under reference 6314, reflecting its archaeological importance as evidence of Early Christian settlement patterns and construction practices in the Castlereagh area. The site remains a tangible record of how communities adapted their building techniques to the local geology and landscape during this formative period of Irish history.
Mound & possible souterrain is a scheduled monument protected by Department for Communities NI under reference 6314. View the official record →
Mound & possible souterrain at Castlereagh is an Early Christian earthwork situated on Sherwood Sandstone bedrock in County Down, Northern Ireland. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 6314.
Mound & possible souterrain dates from the e.christ. period, and is classified as a mound. It is one of over 32,000 scheduled monuments protected across the UK.
Mound & possible 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 6314.
Several scheduled monuments lie within 10 km, including Rath (3.3 km), Barrow (4.2 km), Rath (4.9 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Mound & possible 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.
Mound & possible souterrain stands on Sherwood Sandstone Group, bedrock that formed in the Ladinian. The rock here is sandstone, siltstone and mudstone.