What makes it unusual is not what remains visible but what may lie beneath: a probable souterrain, an underground stone-lined passage or chamber built in early medieval Ireland, typically for storage or refuge, whose presence here is suggested only by a long, irregular hollow sinking into the south-western corner of the enclosure.

The site was recorded by O'Kelly in 1942 to 1943, who described a rectangular raised platform that would once have formed the floor of a fortified enclosure. Around its edge there may originally have been an earthen bank, a defining feature of these ringfort-type structures, though the northern side of that bank has vanished entirely. The hollow in the south-west quadrant is, in O'Kelly's careful phrasing, something that "may be a collapsed souterrain", suggesting the roof of an underground passage has given way over time, leaving the ground above it slightly sunken. Souterrains were commonly built within or immediately beside such enclosures during the early medieval period, serving communities who used the surrounding earthworks for protection. The site is recorded under the reference LI031-093---- and features in an aerial photograph taken in September 2002 for the Archaeological Survey of Ireland, which offers a clearer sense of the platform's rectangular outline than is easy to appreciate at ground level.

Access to sites like this across rural Limerick depends heavily on land ownership and the state of surrounding fields, and there is no visitor infrastructure here. The aerial record held by the Archaeological Survey of Ireland, catalogued as ASIAP 307/31, is worth consulting before any visit, as the earthwork reads more legibly from above than it does on foot. On the ground, what you are looking for is the subtle rise of the platform itself and, in the south-western quarter, the elongated depression that hints at something once constructed carefully underground and now slowly collapsing into itself.