Known locally as the liss, a name derived from the Irish word for a fairy fort or enclosure, this is the kind of early medieval ringfort that was once common across Ireland, built as a defended farmstead sometime between roughly 500 and 1200 AD. What makes this particular example quietly arresting is not its grandeur but its near-disappearance: the enclosing bank, some forty metres in diameter, survives in very poor condition, standing only about twenty centimetres above the interior ground level and less than a metre on the outer face, its top just two metres wide and largely swallowed by bushes.

Ringforts, or raths, were typically constructed by a farming family of some means, the bank and any accompanying ditch serving as much as a marker of status and a pen for livestock as a serious defensive barrier. This one at Raheen Oughter has been hemmed in over the centuries by agricultural field walls, which now encircle it on most sides, leaving only the southern and south-eastern arc relatively free of later encroachment. The site carries an additional layer of significance: associated with it is a children's burial ground, known in Irish tradition as a cillín. These unconsecrated burial plots, typically used for unbaptised infants or others excluded from formal church burial, are found at many ringfort sites across Ireland, reflecting a folk belief that such ancient, liminal places held a kind of sanctity of their own, outside the boundaries of the parish but not entirely outside the sacred.