It appears only from the air, as a cropmark, the faint circular impression left in grass or grain when buried archaeological features alter how plants grow above them. This is a site that has effectively retreated underground, leaving its outline to be read by cameras rather than by anyone walking the land.

The cropmark traces a circular enclosure roughly thirty metres in internal diameter, defined by a single fosse, the ditch that would originally have encircled and protected the settlement inside. The fosse is about four metres wide, and a gap of around five metres on the south-eastern side marks what was once the entrance. Ringforts of this type, known in Irish as raths, were the most common form of rural settlement in early medieval Ireland, typically dating to somewhere between the sixth and tenth centuries. Most were farmsteads, home to a single family and their livestock, enclosed by an earthen bank and ditch for both security and social display. The Islafalcon example is modest by any measure, a single-enclosure rath without the additional ditches that would have indicated higher status, but its position on a slope with views down to Wexford Harbour gives it a quality that the bare dimensions do not fully convey.