To the eye it reads as an ordinary field feature, an egg-shaped rise enclosed by an eroded earthen bank, with no grave markers, no inscriptions, and no visible surface trace of the burials that were once made here. Yet this is a cillín, an informal burial ground of the kind used across rural Ireland for unbaptised infants, children who, under Catholic theological convention, could not be interred in consecrated ground. The choice of location was rarely accidental.

The enclosure itself is almost certainly older than its funerary use. The broad bank and its external fosse, a shallow defensive ditch running from the south-west around to the north-west, are the characteristic features of a ringfort, the type of enclosed farmstead that was built and occupied widely in early medieval Ireland, roughly between the fifth and twelfth centuries. The 1838 Ordnance Survey Name Books, which recorded place-name and local knowledge across Ireland during the great mapping project of that period, noted the site explicitly, describing it as a large fort in the townland of Athea Upper in which children who die without baptism are buried. That entry, made under Rathronan Parish, is one of the clearer documentary records linking a known earthwork to this particular practice. A field boundary has since cut into the enclosing bank at its narrowest eastern point, and the interior slopes gently down towards the centre.

The site lies in pasture and is not managed as a formal heritage attraction. An aerial photograph taken in March 2006 by the Archaeological Survey of Ireland gives the clearest sense of the enclosure's shape, which is less obvious from ground level where the bank is significantly eroded. Visitors exploring the area should expect a working agricultural landscape with no signage or interpretation on site. The absence of any visible burial markers is typical of cillíns generally, where interments were often made quietly and without formal monument. What remains is the earthwork itself, the faint geometry of a much older structure that communities returned to, long after its original purpose had been forgotten, because old enclosures carried a weight that made them feel like appropriate ground.