The burial ground is irregularly shaped, running roughly 45 metres on a northwest to southeast axis and about 20 metres across, its boundaries defined partly by the ringfort's own inner bank and partly by a townland boundary wall. Inside, larger stone slabs lie over individual graves, and among them a dense concentration of smaller set stones is arranged in a north to south alignment.

The site belongs to a tradition found across Ireland of burying unbaptised children, and sometimes stillborns, in places set apart from consecrated ground. These sites, known in Irish as cillíní or cilliní, were frequently located at liminal or ancient spots, old enclosures, boundaries, and shorelines, places already understood to exist at the edge of ordinary social and religious life. The choice of a ringfort, a circular earthwork enclosure typically dating from the early medieval period, would have felt appropriate in that sense: ringforts were associated in folklore with the otherworld and with earlier, pre-Christian inhabitants, which made them neither entirely sacred nor entirely secular. At Tonrevagh, the small set stones inside the enclosure appear to have been robbed from what was once a cashel-like wall, that is, a drystone enclosing wall of the kind more commonly associated with stone-built ringforts in the west of Ireland. Their reuse as grave markers gives the interior a dense, purposeful character that is still legible in the arrangement of the stones today.