It would be easy to walk past without noticing it, and indeed the site has been partially levelled over time, leaving very little to announce itself to the casual eye. What remains is a slightly raised circular area, roughly 32 metres from north to south and 29 metres from east to west, edged by a low broad earthen bank some six and a half metres wide. Both the internal and external height of this bank measures just 0.2 metres above the surrounding ground, which gives some sense of how thoroughly the centuries, and likely agricultural activity, have worn it down.

This kind of monument is known as a rath, the Irish term for a ringfort, a form of enclosed settlement that was built and occupied across Ireland from roughly the early centuries of the first millennium through to the Norman period. Ringforts typically consisted of a circular area enclosed by one or more earthen banks, sometimes accompanied by a fosse, which is a surrounding ditch dug to heighten the effect of the bank. At Sheeanmore, no fosse is visible at ground level, though one may originally have existed before the site was disturbed. The southeastern to southwestern arc of the enclosure is defined now not by a surviving bank but by a low scarp, a slight drop in ground level, suggesting that this portion of the bank has been lost entirely. The original entrance, which in other ringforts often appears as a gap or a causeway across the fosse, cannot be identified here at all.