The raised circular area measures just over 28 metres in diameter, and what survives of its enclosing bank, a low ridge of earth and stone no more than 20 centimetres high and around 2.4 metres wide, runs only from the south around through the north and north-east. The rest has been levelled, absorbed quietly into the working landscape around it.

This is a rath, the Irish term for a ringfort, which was the standard form of enclosed rural settlement in early medieval Ireland, typically dating from roughly the sixth to the twelfth century. Most were built to protect a farmstead and its inhabitants, defined by an earthen bank and an external ditch, known as a fosse. Here, no fosse survives, and the original entrance is no longer identifiable. The remaining section of bank has been modified and incorporated into a field boundary, which is how a great many of these structures have persisted into the present, not as preserved monuments but as incidental features of farms that have simply continued around them. The place name Rathmore, meaning "great rath" in Irish, suggests the area was once associated with a significant enclosure, though whether that refers to this particular earthwork or to something larger and now lost entirely is not recorded.