What makes this ring barrow, a circular funerary earthwork typically consisting of a central mound enclosed by a ditch and outer bank, particularly arresting is not just its scale but the accumulation of later meaning that has settled around it. Protruding from the south-western section of the fosse, the encircling ditch, is a natural rock outcrop with a decorated surface, known locally as a mass-rock. Mass-rocks were used by Catholic communities during the Penal era, when public worship was prohibited, as improvised outdoor altars for clandestine religious gatherings. That a community would choose a site already ancient and set apart, one with its own atmosphere of significance, is not unusual in Ireland, but the physical survival of both layers together in a single monument is quietly remarkable.

The mound itself is enclosed by an inner fosse roughly two metres wide, with an external bank some five metres across, though the western side has been cut through by a later stone field boundary. A smaller ring barrow once stood about 20 metres to the north-west, though that has since been levelled, leaving this example as the dominant presence on the hilltop. From here, the burial mound on Croghan Hill is clearly visible some four and a half kilometres to the west, a reminder that these elevated prehistoric monuments were rarely positioned without an awareness of the wider landscape and of one another. Whether their builders intended such visual relationships as statements of territory, lineage, or something else entirely, the sightlines themselves have survived the millennia intact.