What looks at first glance like an uneven field is in fact the outline of a rath, the Irish term for a ringfort, one of the most common yet persistently underappreciated monument types in the Irish countryside. Ringforts were typically circular enclosures defined by earthen banks and ditches, used as farmsteads during the early medieval period, roughly between the fifth and twelfth centuries. Thousands survive across Ireland, many of them so worn down by centuries of agriculture that they are easier to read from the air than from the ground.

The ringfort at Kilmoreen sits on a break in an east-facing slope, and its dimensions have been recorded with some care. The roughly circular enclosure measures approximately 35.4 metres north to south and 33.6 metres east to west. What survives of its defining boundary is a scarped edge, meaning a deliberately cut or shaped drop in the ground surface, running from the south-east around to the north-east. This scarped edge reaches a height of around 0.6 metres and a width of just over five metres, and it is best preserved along the western side. On the north-east to south-east arc, the natural fall of the hillside itself does much of the work of defining the perimeter. Inside the enclosure, the western half is relatively level, while the ground slopes away to the east. The site was compiled by Denis Power and aerial photographs were taken in March 2006 as part of the Archaeological Survey of Ireland record.

The site lies in pasture, which means access would depend on landowner permission, as is standard for field monuments of this kind across Ireland. Because the earthworks are subtle, the best conditions for reading the site are low winter or early spring light, when shadows pick out slight changes in relief that summer grass can completely obscure. The aerial photographs taken in March 2006 would have benefited from exactly this quality of light. Visitors who do make it to the field should focus attention on the western arc of the scarp, where the preserved edge is most legible, and look back across the interior to appreciate how the slope would have been selected and modified to create a workable, enclosed space on otherwise uneven ground.