Ringforts, known in Irish as raths, are circular enclosed settlements typically dating from the early medieval period, built from earthen banks and ditches to define farmsteads and provide a degree of protection for livestock. This one occupies a quietly marginal position, topographically and administratively, the kind of place that slips easily between jurisdictions.

The fort was recorded as 'Gortnaderk Fort' on the Ordnance Survey Ireland six-inch map of 1840, shown there as a clearly circular enclosure. By the time the twenty-five-inch edition was produced in 1897, the picture had become more complicated. The survey depicted a roughly circular area of around thirty metres in diameter, defined partly by a scarp running from the south-east around to the south-west and from the north-west to the north, but elsewhere simply following a field boundary. Subsequent agricultural activity truncated the monument at both the east and west sides, where field boundaries running north-west to south-east cut across it. The site name, Gortnaderk, combines the Irish word gort, meaning a field or enclosed area, with an element likely referring to colour or character, though the precise meaning of the full name is not recorded in the survey notes compiled by Martin Fitzpatrick in November 2021.

On the ground today, the fort is most legible from satellite imagery rather than from close inspection. Digital Globe orthoimages taken between 2011 and 2013, as well as Google Earth photographs, show a roughly circular shape picked out by a ring of bushes, the kind of scrubby self-seeded growth that tends to colonise old earthworks left undisturbed at the margins of working fields. The surrounding pasture is wet, which is worth bearing in mind underfoot. The Tooraleagan River nearby offers a useful landmark for orientation. The scarp sections, where they survive, are the most tangible physical remains, and the contrast between the overgrown circular outline and the clipped grazing land around it gives the site its quiet legibility, even as the field boundaries eat gradually into its edges.