This stone cashel, measuring approximately 31.5 metres north-northwest to south-southeast and 28.8 metres northeast to southwest, consists of two concentric stone walls that once enclosed a protected living space. Though time has taken its toll, with portions of the walls now collapsed, grassed over, or partially removed, the site still clearly reveals its original circular design, with the inner enclosure maintaining a diameter of about 15 metres.

The space between the two defensive walls forms a level, grassed area roughly 5 metres wide, whilst the outer wall survives only in fragments. A modern wall now follows the line of the inner enclosure on the southern side, and a trigonometrical station has been built within the interior. The ground inside the cashel is uneven, punctuated by natural rock outcrops that would have been incorporated into the original settlement’s design. Two circular depressions in the southwest quadrant likely mark where structures once stood; perhaps dwelling houses or storage buildings that sheltered the cashel’s inhabitants centuries ago.

Situated amongst fair pasture land interspersed with rougher terrain and rock outcrops, Cashelbane commands an impressive view westward over Kilcar town below. This strategic positioning was no accident; ringforts like this one served both as fortified homesteads for farming families and as symbols of status in early medieval Ireland, typically dating from the early Christian period between 500 and 1200 AD. The site was documented as part of the comprehensive Archaeological Survey of County Donegal in 1983, preserving its details for future generations to study and appreciate.