About twenty-five metres across, it reads at first as little more than a slightly raised, scrub-covered ring, the kind of thing a walker might step over without a second thought. But the scarp that defines its edge marks the outline of an enclosure, a class of earthwork found across Ireland that typically served as a farmstead boundary in the early medieval period, though the exact date and function of this particular example remains unrecorded.

The site sits on a gentle north-facing slope, its circular form interrupted on the western side by a field drain running north to south. That drain is a reminder of how agricultural improvement over the centuries has cut through, silted over, and quietly dismantled countless such features across the Irish countryside. Here, the enclosure survives well enough to be traced, its shape still legible beneath the scrub. A scarp, in earthwork terms, is simply a steep face or slope in the ground, the kind of profile left when an original bank or ditch has partially collapsed and settled over time. What remains at Lissardboola is modest but coherent, a roughly circular platform defined by that eroded edge.