A ringfort, known in Irish as a lios or rath, was typically a circular or subcircular earthen or stone-banked enclosure used as a farmstead during the early medieval period, roughly between the fifth and twelfth centuries. Here, the defining bank has collapsed and grassed over, leaving a low stony ridge that traces an approximate circle some 43 metres east to west and 41 metres north to south. Later agricultural life has further blurred the outline: a field wall was built directly over the bank along two separate stretches, effectively pressing the older monument into service as a convenient boundary.

The site carries a name worth preserving. James Hardiman, the Galway historian and antiquarian, recorded it in 1846 as Lios na hÁilliughadh, a more precise rendering than the anglicised placename attached to the townland. Inside the enclosure, a series of further collapsed stony banks may mark internal divisions, the kind of sub-divisions that sometimes indicate separate functional zones within a single household compound. A stone-lined gap on the north-north-east side may be the original entrance, though the qualification "may be" is honest; centuries of field clearance and wall-building have left enough ambiguity that certainty is difficult. What remains is quiet, unprepossessing, and genuinely old, a slight rise in undulating Galway grassland that rewards a careful eye more than a passing glance.