A rath, as this type of monument is known, is a roughly circular enclosure built during the early medieval period, typically defined by one or more earthen banks and accompanying ditches, and used as a farmstead or place of habitation. This one measures about 36 metres in diameter, a modest but respectable size, and would once have presented a clear, enclosed form in the landscape. Today, that form is only partially legible.

What makes Pollacorragune quietly interesting is the degree to which the monument has been absorbed and obscured by later agricultural use. Two banks and an intervening fosse, the term for a ditch cut between earthen ramparts, survive on part of the circuit, but from the north-east around through the east to the south-east, no surface trace of the enclosing elements remains at all. The losses do not stop there. A later field bank, the kind of boundary built to divide grazing land, has been laid directly over the outer bank along the stretch running from west-south-west to north-west. It is a common enough fate for earthworks of this kind in Ireland, where generations of land management have quietly cannibalised earlier features, incorporating old banks into new boundaries or simply ploughing them flat. The result here is a monument that reads, on the ground, as something fragmentary and ambiguous, its early medieval origins only apparent once you know what you are looking at.