The enclosure is subcircular in plan, measuring roughly 41 metres north to south and nearly 39 metres east to west, and is defined by a scarp, a low sloping edge in the ground, that runs between about half a metre and just under a metre in height. What makes it genuinely ambiguous is that nobody is quite certain what it is, or when it was made.

The location and shape would suit a rath, the term used for a circular earthen enclosure typically associated with early medieval settlement in Ireland, where a farming family would have enclosed their homestead within a bank and ditch for both practical and social reasons. Thousands of raths survive across the country in varying states of preservation. But the Carra example may belong to a later period entirely. The interior of the enclosure rises towards its centre, and traces of cultivation ridges running east to west are still visible across it, suggesting that at some point the ground inside was worked for tillage. That pattern of use complicates any straightforward reading of the site. Whether the ridges came before or after the enclosure, or whether the enclosure was ever primarily a settlement feature at all, remains unresolved.

The earthwork is poorly preserved, and a casual eye might not register it as anything deliberate at all. What survives is essentially a low shelf in the hillside, visible midway around the hummock rather than at its summit. That subtlety is, in its own way, part of what makes the site worth attention: it is the kind of place that rewards a slow walk and a willingness to read the ground carefully rather than to expect anything obvious or dramatic.