Known locally as Lismoyle or Lios Maol, a name that translates roughly as the "bare fort" or "flat fort", this early medieval enclosure near Astee in north Kerry sits quietly in the landscape, its original purpose obscured by time and cattle. Despite a substantial internal diameter of 56 metres, the structure offers no obvious way in, at least none that survives. Numerous gaps exist in the earthen banks, but these are the work of livestock rather than ancient builders, and no original entrance has been identified.

The site is what archaeologists classify as a bivallate rath, meaning it was once enclosed by two concentric banks rather than the single bank more commonly seen across Ireland. Ringforts of this type were typically the farmsteads of the early medieval period, roughly the fifth to twelfth centuries, with the banks serving as boundaries and animal enclosures rather than true fortifications. At Lismoyle, the inner bank still stands around 0.8 metres on its outer face and 0.6 metres above the interior ground level. The outer bank has fared less well, surviving only along the eastern side, where it rises 0.6 metres above the fosse, the external ditch, which measured some 7 metres in width. The gradual disappearance of that outer circuit, and the erosion of whatever entrance once existed, leaves the site in an intriguing state of incompleteness, readable in outline but stripped of much of its original detail.