The enclosure at Lissernane sits on the north-east-facing slope of a low natural rise, and at first glance it has the profile of a ringfort, the type of enclosed farmstead that dots the Irish landscape in the thousands, most of them dating to the early medieval period. But the evidence here points in a different direction entirely.

The enclosure measures roughly 75 metres across its north-south axis, which is notably large even by ringfort standards. Its earthen bank is 2.3 metres wide, standing about 0.7 metres above the interior ground level and 1.7 metres above the exterior, with a facing of drystone walling along its outer edge. A possible entrance gap of around 3 metres opens to the east. What complicates any straightforward reading of the site is its likely date and purpose: the working interpretation is that this is a nineteenth-century ornamental feature, constructed in connection with the ruins of a house of the same period that stands nearby. In other words, rather than a survival from early medieval Ireland, this may be a piece of designed landscape, the kind of earthwork that a prosperous household might commission to impose a sense of order or aesthetic intention on their grounds. The place-name Lissernane, which would normally suggest an older enclosure or fort, does not appear on the 1843 edition of the Ordnance Survey six-inch map, which adds a further layer of ambiguity to any older associations the name might imply.

What remains on the ground, then, is a structure that wears the clothing of antiquity while probably being the product of nineteenth-century landscaping ambition, now quietly decaying alongside the roofless house it once adorned.