The site at Ardcost, overlooking the Portmagee Channel on the Iveragh Peninsula, is a ceallúnach, the Irish term for an informal burial ground used historically for unbaptised infants, who were excluded from consecrated churchyards under Catholic practice. These places occupy an ambiguous territory, neither fully sacred nor secular, and were often sited at field margins, boundaries, or elevated ground. This one occupies a gently sloping field, its presence marked not by any formal enclosure or monument but by the ground itself rising slightly above the surrounding land.

The site takes a roughly rectangular form, measuring just under eleven metres north to south and nearly nine metres east to west, and sits raised about forty centimetres above the surrounding field surface. Along its western edge, a row of five large stone blocks lines the boundary. Within, the ground is uneven and scattered with around eighty small boulders and upright slabs, several of them quartz, a stone with long associations in Irish tradition with burial and the marking of graves. The quartz pieces in particular suggest deliberate placement rather than simple fieldstone clearance, though the distinction between the two is not always easy to draw at sites like this. The archaeological survey of the Iveragh Peninsula, published by Cork University Press in 1996, recorded the site, noting that it does not appear on any mapped survey.