Locally known as Lios a Lin, meaning Fort of the Flax, this ringfort carries a tag that suggests the enclosed ground was, at some point, given over to flax cultivation rather than defence or habitation. Whether that use came centuries after the fort was built, or whether the name is simply one community's way of accounting for a conspicuous earthwork in a working landscape, is not recorded.

The structure itself is a rath, the most common type of ringfort in Ireland, typically a circular enclosure formed by one or more earthen banks and ditches, thought to have served as a farmstead or enclosed settlement during the early medieval period. This particular example is double-banked, with an inner bank rising to around 1.4 metres on its interior face and an outer bank roughly a metre high, separated by a fosse, a ditch, about 1.2 metres deep. A causewayed entrance to the north-east preserves the original approach, with gaps of two metres through the inner bank and 1.5 metres through the outer. On the south-eastern stretch of the inner bank, remnants of stone-facing survive, a detail that hints at a more carefully finished construction than the earthworks alone suggest. More striking still is what lies beneath the interior: a souterrain, an underground stone-lined passage or chamber, sits at the centre of the enclosure. Souterrains are associated with early medieval settlement sites across Ireland and were likely used for storage or, in some interpretations, as places of refuge. When Bowman recorded the site in 1934, the interior was thickly planted with trees; today both banks carry tree growth, which has become part of the fort's character at ground level.