The interior of a ring-barrow, a circular earthen mound typically raised in the Bronze Age to cover the remains of the dead, became in later centuries a resting place for unbaptised children. These informal burial grounds, known in Irish tradition as cillíní, were used for infants who had died before baptism and who, under Catholic doctrine, were considered ineligible for consecrated ground. Families buried these children discreetly, often in liminal or pre-Christian places, and ring-barrows, already set apart from the surrounding landscape, were a common choice.

The arrangement at Doonasleen is known through local tradition rather than any formal record of establishment or use. What makes it quietly arresting is the layering: a prehistoric monument, built perhaps three thousand years ago for purposes we can only partially reconstruct, later adopted by communities navigating grief within the constraints of institutional religion. No surface trace of any burial markers now remains, which means the ground holds whatever it holds in silence. The ring-barrow itself, recorded separately, provides the physical setting; the children's burial ground occupied its interior.