The site is a cashel, a type of ringfort built from drystone walling rather than earthen banks, and this one measures roughly 20.5 metres in diameter. What makes it quietly odd is the degree to which it has simply been absorbed back into the landscape: the outer face of the wall is entirely hidden by dense overgrowth, and a later field boundary has been built directly over the collapsed stonework, so that two different eras of land management are now stacked on top of each other, each obscuring the one beneath.

Cashels of this kind were built throughout early medieval Ireland, broadly between the fifth and twelfth centuries, typically as enclosed farmsteads for a single family or small community. The drystone construction distinguishes them from the more common earthen ringforts found across the country, and they are particularly associated with the west of Ireland, where stone was the most available building material. At Pollagh, very little of the original structure remains legible at ground level. The collapsed wall survives, but only as a smothered outline. The site may also have once included a souterrain, an underground stone-lined passage or chamber that was commonly used in early medieval settlements for storage or as a place of refuge, though its association with this cashel is noted as possible rather than confirmed.