The ringfort that once occupied this north-facing slope in County Limerick has been levelled to the point where it registers more as an impression in the land than a structure upon it. And yet it has not entirely disappeared. The circular outline, some thirty metres across, is still readable in the pasture, a faint negative of what was once an enclosed farmstead of the early medieval period.

Ringforts, known in Irish as raths when defined primarily by an earthen bank and fosse, were the most common settlement type in early medieval Ireland, typically enclosing a family's dwelling, outbuildings, and livestock. The fosse is the external ditch from which material was dug to construct the surrounding bank. At Tulligmacthomas, the fosse now measures just ten centimetres deep and around two and a half metres wide, all that remains after centuries of agricultural use wore the monument down. A slight rise on the inner edge may be the ghost of the original bank. The site was still clear enough in 1923 to be recorded on the Ordnance Survey six-inch map as an embanked circular enclosure, which gives some sense of how much has been lost in the intervening century. A causeway across the fosse on the southern side, just over a metre wide, would have served as the original entrance point into the enclosure. The record was compiled by Denis Power.

The site sits in open pasture, which means access depends on landowner permission, as is standard for most earthwork monuments in the Irish countryside. There are no interpretive signs and nothing to orient a first-time visitor, so it is worth consulting the relevant Ordnance Survey map beforehand and approaching with modest expectations. The best conditions for picking out subtle earthworks like this are a low sun in autumn or winter, when raking light catches even shallow changes in ground level. Look for the slight hollow of the fosse tracing its arc through the grass, and the gentle swell on its inner rim; the southern causeway, if you can locate it, offers the clearest remaining evidence of the original form.