The earthen bank of this ringfort, a rath, has been incorporated into the field fence along its north-western edge, so that what was once a defensive enclosure now does the mundane work of keeping livestock in place. That kind of quiet assimilation is not unusual for Irish ringforts, the roughly circular enclosed farmsteads built between roughly the fifth and twelfth centuries, but it does make them easy to overlook entirely.

The site sits on a break in a south-east-facing slope at Knockboy, the interior levelling off despite the gradient outside. It is a modest example, measuring just over twenty metres in diameter. The enclosing element varies depending on which side you approach: to the south-west, north-west, and north, an earthen bank survives, rising about forty centimetres on its inner face and seventy centimetres on its outer. To the east and south, the natural or modified slope forms a scarp nearly ninety centimetres high, the ground at the top of that scarp tilting gently down towards the flat interior. The bank where it survives is stone-faced, suggesting some structural investment at the time of construction, even if the scale of the enclosure points to a single family farmstead rather than anything more elaborate.

The interior is level and partially covered in ferns, which is a reasonable thing to look for if you are trying to spot a ringfort in pasture: the slight shelter and moisture retention that the bank provides often encourages a different vegetation pattern from the surrounding field. The north-western stretch of bank, now doing double duty as a field boundary, is the most visibly altered section, but it also means the stonework is more legible there than it might otherwise be after centuries of grass and weather.