The ringfort at Mundellihy sits on a north-facing slope above the River Deel, its circular earthen bank enclosing a space of roughly 23 metres in diameter. A ringfort, or rath, is essentially the defended farmyard of an early Irish farmer, typically dating to the first millennium AD, the bank and external ditch serving to keep livestock in and wolves or rival neighbours out. Here, the bank survives to an internal height of about 0.35 metres and an external height of 0.8 metres, with a shallow fosse, the ditch running around the outside, measuring approximately 0.15 metres deep and 2.2 metres wide. These are modest figures, suggesting a site of middling status rather than a great territorial stronghold.

The earthwork has suffered over the centuries, as most of its kind have, through the slow pressure of agriculture and the general indifference of the plough. The bank is noticeably eroded and becomes particularly slight along the north-eastern to eastern arc. Inside the enclosure, the ground is uneven in an informative way: the western half of the interior sits roughly 0.35 metres higher than the eastern half, a subtle internal topography that may hint at the footprint of long-vanished structures or simply at differential settling. The survey was compiled by Denis Power and the record was uploaded in August 2011, preserving a detailed snapshot of a site that continues to quietly weather in its field.

The fort lies in pasture, so access depends on the land being approachable and any gates being passable. The River Deel, visible from the slope, provides a useful orientation point: the monument occupies the ground rising away from the northern bank. The grass cover keeps the interior legible underfoot, though patches of scrub have taken hold in places and will likely spread further without intervention. The low relief means that raking light, especially on a clear morning or evening when shadows lengthen across the ground, makes the bank and fosse considerably easier to read from a distance than at midday.