This ancient earthwork appeared on the 2nd edition of the Ordnance Survey 6-inch map, one of the detailed cartographic surveys that documented Ireland’s archaeological features during the 19th and early 20th centuries. Today, however, no trace of this enigmatic structure remains visible on the ground.

The enclosure was recorded as part of the comprehensive Archaeological Survey of County Donegal, conducted in 1983 by a team of archaeologists led by Brian Lacey. This ambitious project catalogued the county’s field antiquities spanning from the Mesolithic period through to the 17th century, creating an invaluable record of sites that might otherwise have been lost to memory. The survey team’s description, though brief, captures essential details about the enclosure’s setting and appearance, preserving knowledge of a feature that has since vanished from the physical landscape.

Circular enclosures like the one at Drummucklagh are found throughout Ireland and often date to various periods, serving different purposes; from prehistoric ritual sites to early medieval settlements, or even later agricultural features. Without excavation or further documentary evidence, the exact nature and date of this particular enclosure remain uncertain. Its prominent position overlooking the northeastern slopes, however, suggests it was deliberately sited to take advantage of the commanding views, a characteristic often associated with defensive or ceremonial sites in Irish archaeology.