It is not much to look at in conventional terms: a low, tumbled ribbon of stone, no more than 0.4 metres high in places and 0.7 metres thick, threading roughly east-south-east to west-north-west for about ten metres before turning north-north-west for some fifty-two metres, then bending gently westward for a further sixteen. What makes it quietly compelling is precisely that it is still there at all, preserved not by any deliberate effort but by the bog that grew up around it and held it in place.

The wall is a relict field boundary, the kind of structure that once divided and defined the agricultural world of communities who have long since vanished from this hillside. Drystone construction, in which stones are stacked without mortar and rely on their own weight and careful placement for stability, was the standard technique for enclosing land across much of upland Ireland, and boundaries like this one could date to any number of periods, from the early medieval centuries onward. What gives the Cooryeen example particular archaeological interest is its relationship to two nearby hut sites. One of them abuts the western side of the wall directly; the other sits just seven metres further to the west. The proximity of domestic structures to a field boundary of this kind suggests a small settlement unit, a place where people lived and worked the land around them, before the bog slowly crept in and swallowed the whole arrangement.