It is easy to mistake for a natural undulation in the ground. It is not. This is a cillín, the Irish term for an unconsecrated burial ground used historically for those whom the Catholic Church denied burial in hallowed ground, most commonly unbaptised infants.

For centuries across rural Ireland, children who died before baptism were excluded from parish cemeteries under ecclesiastical law. Their families, unwilling to leave them entirely unmarked, established these informal plots, often on liminal ground: the edges of townlands, old ringfort interiors, or ancient earthworks. The Creggaun example is modest in scale, measuring roughly eleven metres north to south and nine and a half metres east to west, and the simple upright stones that indicate the graves carry no inscriptions. There are no names here, no dates. The mound itself, low and subrectangular, is the only real monument to the children interred within it. The practice of using cillíní persisted in some parts of Ireland well into the twentieth century, long after its theological justification had softened in pastoral if not official terms.

The site sits in open grassland and is unenclosed, so there is no formal access arrangement to navigate. The few stone uprights are the main thing to look for once you orient yourself on the slope; they are understated, which in its own way is precisely the point.