This is a rath, the most common type of early medieval enclosure in Ireland, typically built between roughly 500 and 1000 AD as a defended farmstead for a single family or small community. What makes the example at Coolygorman quietly compelling is how much survives despite the indifference of centuries, and how much has been quietly swallowed by the land around it.

The site was recorded by Denis Power and uploaded to the archaeological record in August 2011. The enclosure is roughly circular, with a diameter of approximately 25 metres. An earthen bank defines the perimeter, rising just 0.3 metres on the interior side but reaching 1.25 metres when measured from the outside, which gives a sense of how the ground level has built up within the enclosure over time. Beyond the bank runs an external fosse, the ditch that would originally have been dug to provide the material for the bank itself; here it measures around 0.6 metres deep and 1.6 metres wide. On the northeastern side of the bank there is a gap of roughly 2.4 metres, most likely the original entrance. The fosse on the southwestern to north-northeastern arc has become waterlogged and has been widened through erosion caused by cattle moving through the area, a gentle but persistent kind of damage that no surveyor can fully arrest.

The interior and most of the enclosing bank are covered in dense overgrowth, which means that visiting requires a reasonable tolerance for undergrowth and uneven footing. Because the site sits in working pasture, conditions underfoot will vary considerably depending on the season and recent weather, and the waterlogged section of the fosse is likely to be particularly soft after rain. The northeastern gap is the most practical point of entry, and standing there it is still possible to read the shape of the whole enclosure from the way the vegetation rises and falls around you. There is no formal access arrangement noted for the site, so any visit should be made with awareness that this is agricultural land.