Somewhere beneath the grass, or rather distributed invisibly through it, lies what was once a small circular embanked enclosure called Lisbeg, a name derived from the Irish lios beag, meaning "small fort" or "small enclosure". The lios, or ringfort, was one of the most common settlement forms in early medieval Ireland, a circular area enclosed by an earthen bank and ditch, typically used as a farmstead. This one was modest even by those standards, measuring somewhere between ten and fifteen metres in diameter.

Lisbeg appears on the Ordnance Survey six-inch maps of 1837 as a small circular embanked enclosure, clearly defined enough to be plotted and named. By the time the 1930 edition was produced, it had been reduced to a hachured area on the map, the cartographic convention used to indicate disturbed or degraded ground, suggesting the enclosure was already deteriorating by that point. At some stage after that, it was levelled entirely. No trace remains visible at ground level today, which places Lisbeg in a melancholy but common category: a site known to archaeology only through historical mapping, its physical form erased by the slow pressure of agricultural improvement over the course of the twentieth century.

There is nothing to see here in any conventional sense, and that absence is itself worth sitting with. The 1837 surveyors who recorded it were working during a period when hundreds of such features still dotted the Irish countryside, many of them already ancient. The fact that Lisbeg was named on both map editions suggests it retained some local identity, even as it diminished. The name at least has outlasted the earthwork.