Known locally as 'the lios', a word that usually refers to a fairy fort or ring-fort, this small hummock served for generations as a children's burial ground. There are no grave-markers, no enclosing wall, no visible signs at all that the ground underfoot was once a place of deliberate, careful interment.

Sites of this kind, often called cillíní or killeens, were used across Ireland for the burial of unbaptised infants and others considered ineligible for consecrated ground under Catholic Church practice. They tend to occupy marginal or liminal spots: old ring-forts, field boundaries, shorelines, and, as here, slight rises in flat land. At Muingbaun, local memory holds that the last burial took place around 1900, suggesting the site remained in use well into living memory at the time it was first documented. Between the mid-1930s and mid-1940s, the hawthorn trees that had grown across the mound were removed, though whoever cleared them left the graves themselves undisturbed. Hawthorn has deep associations in Irish folklore with fairy places and the threshold between worlds, which may partly explain why a children's burial ground came to be called 'the lios' at all. Quarrying has since encroached on the southern edge of the site, further obscuring its boundaries.