The wall is only a single course high and barely twenty centimetres above the ground surface, but that near-erasure is part of what makes it interesting. It pre-dates the bog that once covered it, meaning the peat grew up and over this boundary long after whoever built it had gone, preserving it in a kind of accidental burial before modern cutting exposed it again.

Archaeologists Quinn and Carroll, writing in 2010 as part of a heritage assessment for a proposed wind farm at Doonens, recorded the wall as running roughly northwest to southeast before turning south, with a length of 42 metres and a width of 0.8 metres. It is built from random uncoursed stone, meaning the builders used whatever material came to hand rather than laying stones in regular horizontal rows. The wall may be a continuation of a separate recorded field boundary nearby, suggesting this was once part of a broader pattern of land division, a pre-bog agricultural landscape that has since largely disappeared beneath the peat. Pre-bog walls of this kind are relatively uncommon survivals; because they were sealed by accumulating peat, they can escape the robbing and reuse that erases so many dryland field systems over the centuries.