A killeen, in Irish tradition, typically refers to a small burial ground for unbaptised infants, often associated in folk memory with older, pre-Christian enclosures. Whether that association explains the name here is not recorded, but it lends the site a particular quality of layered meaning that purely military or domestic explanations rarely capture.

The fort belongs to the broader class of raths, which are ringforts, the circular or near-circular enclosed farmsteads that were the standard unit of rural settlement in early medieval Ireland, roughly between the fifth and twelfth centuries. This particular example occupies a spot where a small stream once marked the boundary between two distinct administrative units, both carrying the placename Ballyvalode: one part of Doon Parish, the other of Oola Parish, as recorded on the 1840 Ordnance Survey map. By the time the 25-inch edition appeared in 1897, the townland and parish boundary had shifted westward, quietly erasing one of the geographic clues the earlier map preserved. The Archaeological Survey of Ireland recorded the site in 2008, describing a suboval earthwork measuring roughly 19 metres on its north-east to south-west axis and 16.5 metres across. The surrounding bank, once the defining feature of the enclosure, is now considerably reduced, standing only 0.35 metres above the external ground surface at its best-preserved points. A shallow external fosse, the ditch that would originally have reinforced the bank, survives on the northern side, and a possible entrance gap some four metres wide has been identified at the east-south-east. The earthwork appears on aerial imagery from as recently as 2018, its suboval outline faintly legible from above even where it has almost vanished at ground level.

Access is through working farmland, so the usual courtesies apply. The monument sits in pasture, and the most coherent impression of its shape comes not from walking the perimeter, where the bank has in places been reduced to little more than a low scarp, but from studying aerial views beforehand. The northern arc, where the fosse is still traceable, gives the clearest sense of the original structure. The survey was compiled by Alison McQueen and Vera Rahilly for the Archaeological Survey of Ireland, and their sketch plan and cross-sections remain the most precise record of what survives.