While the first edition of the Ordnance Survey 6-inch map shows no trace of this structure, local archaeological records confirm it existed in an area densely populated with ringforts, those distinctive circular earthworks that dot the Irish countryside. The exact nature and purpose of this particular enclosure remains tantalisingly unclear; it could have been another ringfort, a ceremonial site, or perhaps something else entirely.

This lost enclosure forms part of Donegal’s rich archaeological tapestry, which spans from the Mesolithic period through to the 17th century. The area around Drumnagroagh would have been an attractive location for early settlers, with its fertile land and strategic position. Ringforts, typically dating from the early medieval period (roughly 500 to 1200 AD), served as fortified homesteads for farming families, offering protection for both people and livestock whilst demonstrating the social status of their inhabitants.

The documentation of this site comes from the comprehensive Archaeological Survey of County Donegal, compiled by Brian Lacey and his team of archaeologists in 1983. This survey represents one of the most thorough catalogues of the county’s field antiquities, recording everything from prehistoric monuments to post-medieval structures. Though the Drumnagroagh enclosure itself may be lost to time, its inclusion in this survey ensures that its existence, however enigmatic, remains part of the historical record.