Ordnance Survey mapmakers recorded it on both the first and second editions of their maps, suggesting it was a recognisable feature of the landscape at least through the nineteenth century, yet today there is nothing on the ground to confirm it was ever there at all.

A rath is an earthen ringfort, the most common type of early medieval settlement in Ireland, typically consisting of a circular bank and ditch enclosing a domestic space. A univallate example, as this one is described, would have had a single such enclosure rather than the double or triple rings seen at more elaborate sites. What has happened at Ahimma is less clear. The feature may have been gradually levelled by centuries of agricultural activity, or it may have been a marginal case even when the surveyors noted it, a faint earthwork already fading when it was first committed to the map. C. Toal, who documented it in the North Kerry Archaeological Survey published in 1995, could find no surface trace remaining.

What remains is the category of ghost site, a place that archaeology acknowledges without being able to point to. The OS maps preserve the memory of it, but the field offers nothing back.