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Castlereagh hengiform enclosure is a possible henge monument located in County Antrim, Northern Ireland. Henges are Neolithic ritual monuments consisting of a circular or oval ditch with an internal or external bank, typically dating to between 3000 and 2000 BCE. This site sits upon Sherwood Sandstone Group bedrock, comprising sandstone, siltstone and mudstone deposits laid down during the Ladinian period of the Triassic era. The underlying geology would have presented particular challenges for Neolithic communities constructing ditches and banks, as the friable sandstone would have required careful management of loose material during excavation.
The monument is classified as hengiform rather than a definite henge, reflecting uncertainty about its precise form or function. Such ambiguous designations typically indicate incomplete preservation, unclear earthwork morphology, or diagnostic features that do not fully conform to standard henge characteristics. The site's exact appearance and dimensions would have been influenced by the local bedrock conditions and the Neolithic builders' adaptation to the particular geology.
The enclosure is protected as a scheduled monument under Historic Environment Division reference 16288, ensuring its preservation for future study and public understanding of Neolithic ritual practices in Ulster.
Hengiform enclosure is a scheduled monument protected by Department for Communities NI under reference 16288. View the official record →
Castlereagh hengiform enclosure is a possible henge monument located in County Antrim, Northern Ireland. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 16288.
Hengiform enclosure 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 16288.
Several scheduled monuments lie within 10 km, including Motte (6 km), Rath (6.4 km), Deserted settlement (6.6 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Hengiform enclosure'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.
Hengiform enclosure stands on Sherwood Sandstone Group, bedrock that formed in the Ladinian. The rock here is sandstone, siltstone and mudstone.