The structure is modest in scale, roughly 14 metres east to west and 13 metres north to south, but what makes it quietly arresting is its double construction: an inner and an outer row of contiguous upright slabs forming a wall about a metre wide, the stones standing to around 45 centimetres above the bog surface. Some lean, some have fallen, and a large boulder has been worked into the northeast section of the wall, suggesting either opportunism or deliberate emphasis at that point.

This kind of dry-stone enclosure, defined by closely set upright slabs rather than mortared courses, belongs to a tradition of boundary-making that stretches back through the prehistoric and early medieval periods in Ireland, though pinning a precise date to any individual example without excavation is rarely possible. What adds texture to the Cloontreem site is its wider landscape context: it sits within an area of pre-bog walls, meaning that beneath and around it lie the traces of field systems that were already old when the bog began to grow over them. The bog, in other words, is not simply a backdrop but a kind of archive, preserving in its layers evidence of land use that long predates any written record. A 2-metre gap on the north-north-east side of the enclosure is tentatively read as an entrance, and the interior, though level, is heavily overgrown with rushes, making any close examination of the ground surface difficult.