Half the monument has effectively vanished at ground level, leaving only the eastern arc to tell the story of the whole. It is a quietly instructive kind of ruin, one where the damage is legible and the survival, partial as it is, still rewards careful looking.

Ringforts, sometimes called raths, were the most common form of rural settlement in early medieval Ireland, typically comprising a circular area enclosed by an earthen bank and an outer ditch, known as a fosse, and used as a farmstead or homestead. At Killynan, the surviving eastern half preserves just enough of that pattern to read: a low bank roughly one and a half metres wide and half a metre high, degraded in places to little more than a scarp, with a fosse about two metres across running outside it. The arc is best preserved from the north through the east to the south-east. At the centre of the enclosure, a small semi-circular rise in the ground may be the remnant of a hut site, though the same fence that divided the ringfort has cut through this feature too. When the first edition Ordnance Survey six-inch map was made in the nineteenth century, the site appeared as a small plantation of trees, a detail that suggests it was at least recognisable as something distinct from the surrounding farmland, even if its origins were no longer fully understood. Immediately alongside the better-preserved eastern section, well-preserved post-medieval cultivation ridges survive in the same field, the parallel earthworks of lazy-bed farming sitting in quiet proximity to a monument many centuries older.