What you are looking at is essentially the outline of an early medieval farmstead, a form of enclosure built across Ireland roughly between the fifth and twelfth centuries. The bank and its accompanying fosse, the shallow external ditch that runs from the southern side around to the northwest, were enough to define a household's territory, keep livestock in, and signal a degree of social standing to anyone passing by. Thousands of these monuments survive across the island, yet each one occupies its ground in its own particular way, shaped by the slope, the soil, and whatever has happened to it since.

The Tinnakilla rath sits on a south-facing slope, which would have made practical sense for anyone choosing a spot to settle: better light, some shelter from northerly weather, and a gentle gradient that encourages drainage. The enclosure itself is roughly circular, measuring 30.2 metres north to south and 30.6 metres east to west, dimensions that fall well within the typical range for a single-family rath. The earthen bank still stands to an internal height of around 0.8 metres and reaches 1.75 metres on its outer face, though it has not come through the intervening centuries unscathed. Cattle grazing within and around the enclosure have worn the bank down considerably in places, and the northern section has been largely swallowed by gorse. The external fosse, where it survives, is about two metres wide and just over a third of a metre deep. These details were recorded by Denis Power and uploaded to the survey record in August 2011.

The site lies in open pasture, so access will depend on the landowner's goodwill, and the ground underfoot will be rough grazing rather than anything maintained. The interior slopes gently southward, which becomes apparent once you are standing inside the circuit. The northern arc of the bank is the least legible section, obscured as it is by gorse, so the clearest sense of the enclosure's shape comes from the southern and western stretches, where the bank and the line of the fosse are still reasonably readable at ground level. Going in late summer or autumn, when vegetation has died back a little, gives the best chance of tracing the full circuit without the gorse making a nuisance of itself.