The one at Liscormick, in County Longford, departs from that norm in a small but telling way: it is D-shaped, with one side running almost perfectly straight rather than curving to close the form. That geometric oddity is not an accident of erosion or later interference; it appears to have been built that way, perhaps to follow the line of a slope or boundary that no longer exists in any recognisable form.

The ringfort sits on an east-facing slope in pasture, where it survives as a raised platform measuring roughly 35 metres on its northeast to southwest axis and 33 metres across. Its edges are defined by a scarp, a low earthen step dropping around 0.6 metres, fronted by an external fosse, a shallow ditch of the kind commonly dug to reinforce the enclosure and deter livestock or unwanted visitors. That ditch is modest by any measure, about 1.8 metres wide and 0.4 metres deep, but it would have been more pronounced when first cut. Over time, sections running from the east-southeast around to the northwest have been absorbed into the surrounding field-boundary system, meaning the farm boundaries that now divide this landscape have quietly cannibalised the ancient earthwork, using its fabric as convenient ready-made walls and ditches. The original entrance has been lost entirely, leaving no trace of where people once passed in and out of this small enclosed world.