The one at Laharan, at the foot of Bailocke Mountain in north Cork, goes considerably further. Three concentric earthen banks, each separated by a fosse, or ditch, wrap around a circular interior roughly 45 metres across. That level of elaboration is unusual, and it points to a site of some significance, whether in terms of the status of its original occupants, a need for genuine defence, or both. The outermost bank has been absorbed into the modern field boundary system to the west, and all three banks are now thickly planted with conifers and deciduous trees, so the profile of the earthworks reads more as woodland than as something ancient and purposefully engineered. Beneath that canopy, however, the structure survives in reasonable condition, with the middle bank remaining uniform all the way around at about 1.25 metres high.

Writing in 1934, a researcher named Bowman recorded the site under its Irish name, Lios an Uisge, meaning Fort of the Water, and noted four ramparts rather than the three visible today, with roughly one-tenth of the outer rampart already levelled by that point. The Irish name is intriguing given the site's position: it sits not in boggy ground but in level pasture commanding an extensive view northward over the River Blackwater valley, so the association with water likely refers to that broad river prospect rather than any marshy character of the immediate ground. Access into the enclosure was originally made through a causewayed entrance to the east, a raised crossing over the fosse that is a typical feature of early medieval Irish ringforts, and there is a secondary break in the middle and outer banks to the south. In the south-western quadrant of the interior lies a souterrain, an underground stone-lined passage or chamber of the kind frequently found within ringforts, typically used for storage or as a place of refuge.