What appears at first to be a modest earthwork in north Kerry is in fact a flat ringfort sitting immediately south-east of a second enclosure, a univallate cahir, meaning a stone ringfort defended by a single wall circuit. The proximity of the two suggests this was once a more complex and purposeful settlement than a casual glance would reveal.

The ringfort at Lismoyle follows a form well-established in early medieval Ireland: a roughly circular interior raised above the surrounding land, bounded by a bank and an exterior fosse, or ditch. What makes this particular example worth attention is the detail surviving within that interior. On the western side, a curved raised area projects from the bank, and out of it extend stone foundations forming a roughly square structure, measuring approximately 8.6 metres by 8 metres, with walls around 1.4 metres thick. A curved stone wall, some 12 metres long and about a metre thick, runs north from the north-east corner of this structure into the bank itself. In the south and south-west sectors, two small semi-circular mounds, each roughly 1.8 metres by 1.5 metres, are folded into the bank; these are interpreted as possible hut sites, the kind of modest sheltered spaces in which people lived and worked within the protected enclosure. The entrance, facing south-east, is around 4 metres wide. These measurements and observations come from the North Kerry Archaeological Survey, compiled by C. Toal and published in 1995, which recorded the site as part of a systematic effort to document the region's early built landscape.

The site sits in Ardagh in Co. Kerry, and while there is no formal visitor infrastructure here, the landscape of north Kerry retains a high density of such earthworks, many of them unexcavated and uninterpreted beyond their surface features. The interest at Lismoyle lies precisely in that ambiguity: the stone foundations are real and measurable, but the lives conducted within them remain open to inference.