The rath at Kilmacoo in County Wicklow has none of that. No entrance survives, no fosse, and the only interior feature is what may be a small spring at the centre. It sits on a gently south-east-facing slope in unimproved mountain pasture, a circular earthen bank enclosing a level interior roughly 24 metres across, the whole thing quietly unremarked in the upland landscape.

A rath, to use the Irish term, is a ringfort built from earth rather than stone, typically dating from the early medieval period and understood to have served as a farmstead enclosure for a single family or small community. The bank here is modest but still legible: between four and five metres wide and standing up to about a metre and a half in total relative height depending on which side you measure from. The interior slopes gently from north-west to south-east, following the natural lie of the hillside. The possible spring at the centre is intriguing precisely because it is unexplained. Fresh water within the enclosure would have been a practical asset for any settlement, but whether this feature is original, incidental, or something else entirely is not recorded. What is certain is that the site was already considered worth mapping in 1838, when it appeared on the Ordnance Survey six-inch sheet produced as part of the first large-scale systematic survey of Ireland.