It is the kind of site that can read, at a glance, as nothing more than a slight change in the land's surface, and yet the shape it describes, roughly 54 metres in diameter, follows a pattern repeated across thousands of sites throughout Ireland.

The feature is a ringfort, or something closely related to one, a form of enclosed settlement that was in widespread use in Ireland from roughly the early medieval period, though some enclosures of this type may have earlier origins. They are defined by a bank or scarp, sometimes accompanied by a ditch, enclosing a roughly circular area that would once have contained a farmstead or small household. The enclosure at Bredagh survives as a low scarp rather than a substantial bank, which suggests either considerable age and weathering or, more likely, that it has been disturbed or degraded over centuries of agricultural use. The most telling sign of that disturbance is the field wall that now runs along the eastern through south-western portion of its circuit, a boundary built at some later point that made use of the existing earthwork as a convenient line to follow, in the process partly burying and redefining what came before. It is a common fate for these sites; the landscape has a way of absorbing earlier structures into its working fabric without ever quite erasing them.