A field in Dunmoylan, County Limerick, holds one such absence. Where pasture rolls on a very gentle east-south-east-facing slope, a ringfort once stood, a type of enclosed farmstead common across early medieval Ireland, typically formed by one or more earthen banks and ditches enclosing a roughly circular area. Here, nothing of it remains.

The 1841 Ordnance Survey six-inch map recorded the enclosure clearly, showing a circular form roughly fifty metres in diameter. By the time the antiquarian Thomas Johnson Westropp documented the site in his 1916 to 1917 survey, the picture was already grim. Westropp described what he called an interesting dun, ninety feet across, with two tall standing pillars leaning towards each other, each between eight and ten feet high. Even then, however, the earthworks had been nearly obliterated, and he noted it was just traceable. The pillars, whatever their original purpose or relationship to the enclosure, had since been broken up entirely. When the site was later inspected and compiled for the national record by Denis Power, no trace of the monument was evident on the ground whatsoever.

The site carries the reference number LI019-244 in the archaeological record, which is effectively the only marker left. Visitors should understand that there is nothing to see here in the conventional sense: no earthwork profile, no stone, no hollow in the ground that betrays a buried feature. The value, such as it is, lies in Westropp's description, which preserves a glimpse of something unusual, two leaning pillars within a levelled enclosure, that raises more questions than the surviving record can answer. Anyone with an interest in landscape archaeology might find meaning in standing on the slope and reading Westropp's words against the unremarkable pasture around them, but the monument itself belongs to the category of things that are known only because someone wrote them down before they disappeared.