The only evidence of its existence comes from early Ordnance Survey maps, specifically the first edition of the OS 6-inch map, which marked it as a single-ringed circular fort. Today, visitors to the area would find no visible traces of this ancient structure above ground, though it likely occupied a small hillock on what remains gently sloping, fertile farmland.

Ringforts were amongst the most common archaeological features across medieval Ireland, serving as fortified farmsteads for prosperous families between roughly 500 and 1200 AD. These circular enclosures, defined by earthen banks and ditches, provided both defence and a statement of status in early Irish society. The Garshooey example, though now lost, would have been typical of thousands scattered throughout the Irish countryside; a reminder of how densely populated and actively farmed these lands were over a millennium ago.

The site’s documentation comes from the comprehensive Archaeological Survey of County Donegal, compiled in 1983 by Brian Lacey and his team of archaeologists. This survey catalogued field antiquities spanning from the Mesolithic period through to the 17th century, preserving crucial information about sites like Garshooey’s ringfort that might otherwise be forgotten. Whilst the physical structure has been erased by time and agriculture, its inclusion in these historical records ensures this piece of Donegal’s ancient heritage remains part of the county’s archaeological narrative.