It is quiet and unremarkable at first glance, bounded by a low, moss-covered wall of earth and stone that has been worn down over time to little more than a hummock. What makes it quietly arresting is its purpose: this was a cillín, a place where unbaptised children were buried outside the boundaries of consecrated ground. In Irish tradition, infants who died before baptism were excluded from churchyard burial, and so communities maintained these informal, often ancient enclosures as places of interment. They are sometimes called keel or cillín grounds, and they appear across the Irish landscape in various forms, often reusing older earthworks or field enclosures.

The site at Coonmore was documented as a 'disused keel' or children's burial ground as early as 1910, when it was recorded by Crawford. No grave-markers were visible at the time of later survey, which is not unusual for sites of this kind; burials in cilliní were rarely marked with formal headstones, and the ground can appear deceptively empty. The enclosing wall, though denuded, still stands between 0.75 metres and one metre high on its outer face in places, and between 0.25 and one metre on the interior. A low linear mound in the south-western quadrant, running roughly north-west to south-east, appears to be the remnant of an old field boundary rather than any funerary feature. The site occupies level ground in what would have been a visually distinct natural setting, with a high scarp rising behind it and the river running close by to the north-east, lending the enclosure a kind of geographical separateness that perhaps contributed to its choice as a burial place.