It is a cillín, an informal burial ground of the sort once used across Ireland for unbaptised infants, those who died before they could receive the sacrament and were therefore excluded from consecrated parish cemeteries. These sites were typically positioned at liminal places, field margins, old earthworks, or land's edge, and the one at Aillebrack sits roughly fifty metres south of the townland boundary, near enough to the sea that the sound of it would rarely be far away.

By the nineteenth century the site was known by two Irish-language names: Guaire na bPaistide and Reilig na bPaistide, both translating roughly as the burial ground of the children. The physical remains are modest to the point of near-invisibility. The site takes the form of a subcircular area, somewhere between three and five metres across, marked by low, uneven mounds and a scatter of small boulders. These understated features are in keeping with cillíní generally, which were rarely given formal markers; a worked stone or a few cobbles placed by a grieving family often constituted the entire memorial. The Irish-language names were recorded by Tim Robinson, the writer and cartographer whose meticulous mapping of Connemara and the Aran Islands brought hundreds of overlooked place-names back into documented use.

The site has not been formally inspected by archaeologists, and its precise condition is unknown. Given its location so close to the shore and its very small scale, it would be easy to walk past without recognising it for what it is. The Irish names, preserved through oral tradition into the nineteenth century and captured in Robinson's fieldwork, are arguably its most durable monument.