Within a radius of roughly 230 metres on this ridge in Cuillaun, there are at least two other raths, one sitting on the crest to the south and another less than 150 metres to the west. Whoever chose this terrace on the north-facing slope was not alone in finding it worth enclosing.

A rath is a roughly circular earthen or stone-built enclosure, typically associated with early medieval settlement in Ireland, most often serving as a farmstead or the residence of a family of some local standing. This one is nearly circular, measuring about 34.7 metres north to south and 33 metres east to west. Its boundary changes character as you move around it: a sod-covered stone bank, varying between about 2.3 and 3.4 metres wide, defines the southern arc, while the northern side resolves into a stony scarp rather than a built bank. A field fence along the north-north-east to south-east section follows the curve of the enclosure so closely that it appears to respect, and perhaps overlie, the original line. The interior slopes very gently downward from south to north, towards the valley of low-lying grassland the site overlooks.

Immediately to the west-south-west of the enclosure lies a slightly raised oblong area, roughly 22 metres by 8 metres, scattered with large stones and boulders. Its purpose is uncertain, but the 1837 Ordnance Survey six-inch map shows a rectangular building abutting the southern side of the ringfort at that date, and the raised ground may be what remains of it. Field fence remnants nearby appear to belong to the same nineteenth-century phase of use. It is a common enough story at Irish ringforts: early medieval origins, then centuries of quiet agricultural reuse, the old bank pressed into service as a convenient boundary long after anyone remembered what it had originally enclosed.