These burial grounds, known in Irish as cillíní (singular cillín), were places set apart from consecrated churchyards, used across Ireland for centuries to inter infants who died before baptism. Catholic teaching held that such children could not be buried in hallowed ground, and so communities quietly maintained these alternative spaces, often in liminal locations: on townland boundaries, near ancient ruins, or close to the sea. The site at Baile An Mhuilinn, known as Kilbrack or An Chill Bhreac, was used for this purpose until the 19th century.

The enclosure is sub-rectangular, measuring 58 metres east to west and 27 metres north to south internally. Three sides are bounded by modern stone field fences, while the southern boundary is a low wall of stone and earth, no more than 0.6 metres high. Within this space, the actual burial area sits slightly raised at the centre, an irregularly shaped patch dense with low upright stones aligned north to south, and a scattering of small cairns. Resting in one of those cairns is a cross-inscribed stone, 0.88 metres tall and 0.15 metres wide, carved on one face with a cross whose arms have expanded terminals. The left arm has been lost entirely to spalling, and the upper arm survives only in part, the stone gradually surrendering its detail to weathering. The site was documented by J. Cuppage in the 1986 Dingle Peninsula archaeological survey, Corca Dhuibhne, which remains a foundational record of the area's early monuments.

The stone itself is easy to miss among the low cairns, and its inscription requires close attention given the damage from spalling, the flaking away of surface layers under frost and moisture. The cross with expanded terminals, where each arm broadens at its tip, is a form found on early medieval stones across Ireland, though assigning a precise date to this example is difficult. What remains is a quiet, weathered place, more legible as a landscape of accumulated grief than as a formal monument.