A low earthen bank curving through a stand of mature conifers is not the most dramatic introduction to early medieval Ireland, but that is more or less what survives at Ballythomas in County Waterford, and it rewards a second look. The enclosure is a rath, the commonest type of ringfort, built as a defended farmstead by an Irish farming family, most likely sometime between the sixth and tenth centuries. Thousands of them were raised across Ireland during that period, each one marking the home and status of a free landowner.

The Ballythomas example is a fairly modest specimen. The interior measures roughly 31 metres from north-west to south-east and 29 metres from north-east to south-west, enclosed by an earthen bank that stands between one and one point three metres on its outer face, dropping to about half a metre on the interior. The bank itself is four to five metres wide, which gives it a solid, deliberate presence even in its reduced state. A gap of two point four metres at the south-south-east marks what was almost certainly the original entrance, a placement that would have faced away from the prevailing Atlantic weather rolling in from the west. The site sits on a gentle westward-facing slope, a position that would have offered reasonable drainage and visibility across the surrounding land. Notably, there is no visible fosse, the ditch that typically runs outside the bank in more elaborate ringforts, suggesting either a simpler original design or centuries of gradual infilling. Ordnance Survey mappers recorded the enclosure faithfully on their six-inch sheets in both 1840 and 1927, by which point the earthwork had already survived long enough to become a minor landscape fixture.

The planted conifers now growing inside and around the bank complicate any visit. Dense coniferous planting tends to suppress undergrowth and obscure surface detail, so reading the shape of the enclosure from within can take some patience. The bank is clearest at the perimeter, where the curve of the earthwork pulls away from the tree trunks and the scale of the original structure becomes easier to appreciate.