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Green Island crannog is a partially submerged artificial island settlement in Drumgay Lough, County Fermanagh. Crannogs of this type, constructed from timber and stone on lake beds, were occupied throughout the Early Christian period and represent a distinctive form of defended domestic settlement in medieval Ireland. This example sits within waters overlying bedrock of the Tyrone Group, Visean in age, composed of limestone, mudstone, sandstone and siltstone interspersed with chert, coal and conglomerate—geology that would have shaped both the lough's formation and the materials available to its builders.
The crannog's position within Drumgay Lough reflects a strategic choice common to such settlements: the water provided natural defence whilst remaining accessible by boat. The artificial island construction technique required considerable labour and skill, with timber piles and woven branches supporting habitation platforms that have left archaeological traces visible to the present day.
Green Island crannog is recorded in the Historic Environment Division's register under reference 10147 and benefits from statutory protection. Its survival as a monument provides evidence of Early Christian settlement patterns and the engineering capabilities of medieval Irish communities in waterside environments.
Green island. crannog in drumgay lough is a scheduled monument protected by Department for Communities NI under reference 10147. View the official record →
Green Island crannog is a partially submerged artificial island settlement in Drumgay Lough, County Fermanagh. It is designated a Scheduled Ancient Monument by DfC Northern Ireland (NISMR) under reference 10147.
Green island. crannog in drumgay lough dates from the e.christ. period, and is classified as a crannog. It is one of over 32,000 scheduled monuments protected across the UK.
Green island. crannog in drumgay lough 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 10147.
Several scheduled monuments lie within 10 km, including Rectangular enclosure (4.7 km), Multi-period church site - monastic site, medieval church & graveyard, cross-shaft & base etc. (6.2 km), Mound, possibly crannog (6.6 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Green island. crannog in drumgay lough'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.
Green island. crannog in drumgay lough stands on Tyrone Group, bedrock that formed in the Visean. The rock here is limestone, mudstone, sandstone and siltstone, with subordinate chert, coal and conglomerate.