A cashel is a stone-walled ringfort, the drystone equivalent of the earthen raths found across Ireland, and this example in County Clare has collapsed to the point where what remains is less a wall than a low spread of rubble. Measuring approximately 23 metres north to south and just over 22 metres east to west internally, the circuit survives as a scatter of stone between roughly 2.7 and 4 metres wide, rising no more than a metre at its tallest on the outer edge. A later tumbled drystone wall sits on top of the earlier collapse, adding a layer of visual confusion to an already difficult site to read. No inner facing-stones are visible, no entrance survives, and ninety percent of the perimeter is smothered in thorn and briar.

The site sits on reclaimed pastureland at the north-eastern end of a low, narrow ridge running roughly north-east to south-west, with short but steep slopes dropping away to the west, north, and east. It appears on the 1915 edition of the six-inch Ordnance Survey map and was formally recorded as an enclosure in the Sites and Monuments Record in 1992 and the Record of Monuments and Places in 1996. What makes the broader grouping at Poulbaun quietly remarkable is the clustering: another cashel lies approximately 150 metres to the south-south-west, and a third is visible roughly 150 metres to the north-north-east. Whether this reflects contemporaneous settlement, sequential reuse of a favoured ridge, or something more communal is not something the surface evidence can answer, but the concentration is unusual enough to give the otherwise unremarkable field a different kind of weight.