What was once a complete circular enclosure, the kind of enclosed farmstead built across Ireland during the early medieval period, has been bisected so cleanly by a field boundary that the eastern half has simply vanished. What remains is a roughly semicircular platform, about 20.8 metres north to south and 11 metres east to west as far as the fence line, sitting on a low rise in rough pasture. The curving western edge is still legible as a low earthen scarp, standing to roughly 0.6 metres externally, with a faint stony lip in places. Hawthorn, blackthorn, and ash have colonised the perimeter and interior, and loose stone covers the ground throughout. A line of sycamores planted along the eastern field bank now stands where the enclosure's wall once curved.

The story of how this rath came to be halved is readable in the mapping record. On the 1838 Ordnance Survey six-inch map, the enclosure appears as a full circle, already clipped on its eastern arc by a field boundary running on a roughly north-northeast to south-southwest axis. By the 1916 edition, that same map shows only a semicircle, the field boundary now forming the straight eastern edge of whatever was left. The enclosure did not disappear suddenly; it was eroded incrementally, the eastern earthworks likely levelled to make farming the adjacent ground easier. A rath, to use the Irish term for this type of earthwork enclosure, typically comprised a raised interior platform ringed by one or more banks and ditches, and served as a defended farmstead. At Aghadiffin, the interior still holds one minor curiosity: a low, irregular, curving stony rise near the western edge, roughly a metre wide and four metres long, set about 2.5 metres in from the scarp. Its function remains unclear.

The site sits in rough pasture and its views are now largely blocked by the trees and field fences that have grown up around it. The western scarp and the sycamore line to the east are the clearest things to look for. The enclosure is classified as a possible rath rather than a confirmed one, which is itself a reminder of how much of the archaeological record survives only in fragments, argued over quietly by maps made decades apart.