This is a leacht, a type of commemorative or devotional cairn associated with early Irish Christian sites, and in this case it measures barely two and a half metres across. The slabs delimit a slightly raised, near-square area, their tops barely breaking the surface of the surrounding ground. It is a quietly insistent kind of monument, easy to miss and difficult to date with precision.

The site belongs to an early ecclesiastical enclosure known as Cill Buaine, which takes its name from St Buonia, also recorded as Beoanigh, who is locally reputed to have been a sister of St Patrick. That association alone places the foundation in the realm of the great early medieval saints, though the historical record is more complicated. It has also been proposed, as noted by O'Donoghue in 1893, that the site was founded by St Brendan, the sixth-century navigator and monastic figure closely associated with this part of Kerry, or alternatively by St Beoanus, one of Brendan's disciples. The leacht itself sits on the southern side of a small oratory, which is the kind of simple rectangular stone chapel typical of early Irish monasticism. Together, the oratory and leacht occupy ground with an unobstructed westward outlook across St Finan's Bay toward the Skellig rocks, a setting that feels entirely consistent with the ascetic geography favoured by early Christian communities along this coastline.

The glen that shelters the approach is broad enough to walk comfortably, but the slope up to the site is fairly steep and south-facing, meaning the ground can be dry underfoot in good weather while the wind off the bay arrives without interruption. The leacht is immediately adjacent to the oratory's southern wall, which provides the clearest orientation once you are on site. The upright slabs are low and unassuming; knowing what to look for, and understanding that the slightly raised platform between them is the point, is most of the work.