It is modest in profile, barely a metre high at its tallest point, yet its proportions and construction mark it out as something considerably older than the field walls that now crowd around it. The enclosure measures roughly 18.5 metres across internally, defined by a low, wide bank of earth and stone some 3.2 metres across, its inner face reinforced with larger boulders set as revetment. Within the interior, a scatter of irregular granite boulders remains in place, their original arrangement, or purpose, no longer obvious. A narrow gap on the western side, just 1.6 metres wide, is the sole formal opening.

The site was recorded and compiled by archaeologists Geraldine Stout and Padraig Clancy, with reference to earlier work by Healy published in 1975. What gives the enclosure its particular interest is its proximity to a passage tomb lying close to the north, recorded separately in the Sites and Monuments Record as DU026-042001. Passage tombs, megalithic burial monuments typically constructed during the Neolithic period, were often situated within broader ritual landscapes rather than in isolation, and the pairing here suggests that this stretch of the Ballybetagh area carried some kind of significance across an extended period of prehistory. The enclosing bank has been clipped on its eastern side by a later field boundary wall, a small but telling detail about how the agricultural present repeatedly edits the ancient past.

The enclosure sits within working farmland, so access requires care and consideration for the landowner. The Glencullen valley is most easily approached from the village of Glencullen itself, which lies just a few kilometres south of the M50 along the Enniskerry road. The slope above the river can be wet underfoot at most times of year, and the earthwork, low as it is, reads best in low winter light when the surrounding vegetation has died back and the bank casts a legible shadow. Once there, look for the contrast between the rough revetment boulders along the inner face and the more irregular stones scattered across the interior; it is in those details, rather than any dramatic silhouette, that the age of the place begins to register.