The site is known locally by the term cashel, which typically refers to a ringfort whose enclosing wall is built primarily of stone rather than earthen material, though here the surviving boundary is a low bank of mixed earth and stone.

The enclosure itself is modest: roughly circular, about twenty metres across, sitting on a gentle east-facing slope in what is now ordinary pasture. The bank survives reasonably well around the western and southern arc, measuring nearly four metres wide at the base, though it rises only about forty centimetres above the interior surface. What makes the site quietly interesting is how its builders, or the geology beneath their feet, shaped the outer edge differently depending on where you stand. On the northern and eastern sides, where the natural ground already slopes away, there is no conventional bank at all; instead the site is defined by a scarped edge, essentially a cut or trimmed drop in the ground, that rises from half a metre to as much as one and a half metres in height as it moves around the arc, compensating for the underlying incline. The original entrance has not been identified, and no fosse, the external ditch that commonly accompanies ringforts, is visible at ground level.

Ringforts as a class are among the most common early medieval monuments in Ireland, typically associated with enclosed farmsteads of the first millennium AD, though their dates and functions vary considerably. This particular example in Corwillick is unremarkable in scale, but the interplay between the artificial bank and the natural topography, one quietly doing the work of the other depending on the direction, gives it a certain logic worth pausing over.