This is a rath, the Irish term for a ringfort, the most common type of early medieval settlement monument found across Ireland. Roughly forty-four to forty-nine metres across, it retains its earthen bank, an external fosse, and traces of an outer bank, giving it a layered, concentric profile that speaks to deliberate, considered construction.

Ringforts were typically built between roughly the sixth and tenth centuries as enclosed farmsteads for free farming families, the bank and fosse serving more as markers of status and boundaries for livestock than as serious military defences. What makes the Haystown example worth attention is the survival of its double-bank arrangement. The inner bank still stands between 0.7 and 1 metre in height on the interior and rises to as much as 2 metres on the exterior at the north-east, where the ground drops away on the slope. The outer bank, now only about half a metre high and surviving only along the north-north-east to south to west-north-west arc, has been removed elsewhere, perhaps by agricultural clearance at some point in the last few centuries. The entrance gap is at the east-north-east, a common orientation for Irish ringforts, and it cuts through both the inner bank at 1.7 metres wide and the outer at 2 metres, leaving a narrow corridor that would once have been a carefully managed threshold between the domestic world inside and the open land beyond. The external fosse, the ditch running between the two banks, varies noticeably in depth from about 0.6 metres on the west to 1.2 metres on the east, a variation that likely reflects both the natural slope of the ridge and centuries of silting and disturbance.