It has no visible entrance, no internal features that surveyors have been able to identify, and no obvious explanation for why someone went to the considerable effort of piling earth and stone into a ring roughly twelve metres across. It is the kind of thing that could pass unnoticed even if you walked directly past it.

An enclosure of this type, a raised bank of earth and stone defining a roughly circular space, is a fairly common feature in the Irish landscape, though the term covers a wide range of possible functions: farmstead boundaries, ritual enclosures, stock enclosures, or structures associated with early medieval settlement. What makes this particular example worth noting is that it does not stand alone. The 1843 Ordnance Survey six-inch map, one of the most detailed early cartographic records of the Irish countryside, shows three such enclosures in this area of Ballyedmonduff, and this is the most westerly of the three. Its companions are recorded separately in the archaeological inventory. The bank itself is two metres wide and stands 1.2 metres high, modest dimensions but substantial enough to have survived plantation forestry largely intact. The record was compiled by archaeologists Geraldine Stout and Padraig Clancy, with a revised upload noted in July 2018.

Access is possible via a forest track that runs along the north-west side of the enclosure. The mature tree cover means the bank can be difficult to read visually at first; it tends to reveal itself gradually as a subtle change in ground level rather than a dramatic earthwork. The Three Rock Mountain area is well walked, and the broader Ticknock forest network has marked trails, so reaching the general area is straightforward. Finding this specific feature requires more attention to the ground underfoot than to the view, which on a clear day pulls insistently toward Dublin Bay and the city below.