The rath, as this type of earthen ringfort is commonly known, is a circular enclosure roughly 44 metres across, defined by a bank of compacted earth that remains, in places, over a metre high. Most Irish raths date from roughly the sixth to the tenth centuries and served as enclosed farmsteads, their banks marking the boundary of a household rather than a fortification in any military sense. What makes this particular example quietly arresting is not just its preservation but what lies beneath it: a souterrain in the south-west quadrant. Souterrains are artificially constructed underground passages, typically dry-stone lined, which were used for storage or, in times of danger, concealment. Their presence within a rath is relatively common, but they are rarely visible to the casual observer, and the knowledge that one runs under this grassy slope gives the site an additional, subterranean dimension.

The bank shows breaks on both the east and west sides, the eastern one narrow at around two metres wide with a faint trace of the original bank still crossing it, the western breach wider and possibly more recent in origin. Inside the enclosure, the interior is largely flat, though a raised linear ridge, about four metres wide and running roughly twenty metres north to south through the eastern sector, suggests something structural beneath the overgrowth, its purpose unconfirmed. Field boundaries in the surrounding land radiate outward from the bank on the west, north, and south-east sides, a pattern that hints at how the wider agricultural landscape may have organised itself around the enclosure over centuries. The site is almost certainly the rath recorded in the 1840s as standing in the centre of Lisroe in the Ordnance Survey Name Books for the parish of Kilcummin. A standing stone lies approximately one hundred metres to the north-east, its relationship to the rath unknown but its proximity suggestive of a landscape that was in use, and meaningful to its inhabitants, across a very long span of time.