A circular enclosure roughly thirty metres across, it sits on a gentle to moderately steep slope facing south to south-east, and yet anyone who goes looking for it today will find nothing. No earthwork, no visible bank, no depression in the field. It is, in practical terms, invisible at ground level.

What we know of it comes largely from the Ordnance Survey's six-inch map of 1838, where it appears as a hachured feature, the cartographers of the time using short radiating lines to indicate a raised or embanked form on the landscape. That it was recorded at all suggests it was at least partially legible to surveyors in the early nineteenth century. Circular enclosures of this kind are among the most common archaeological monument types in Ireland, ranging from prehistoric ring ditches to the ringforts, or raths, of the early medieval period, typically farmsteads enclosed by an earthen bank and ditch. Whether this example at Killegar belongs to any of those traditions is not recorded. Nearly two centuries of agriculture, erosion, and general landscape change have apparently done enough to erase whatever earthwork once gave it definition.