The arrangement looks almost incidental, as though the boulders simply came to rest that way, but the geometry is deliberate and very old. These are boulder-burials, a form of prehistoric funerary monument found almost exclusively in Munster, in which a substantial capstone is raised on low supports to create a minimal covered space, presumably once used for the interment of human remains.

What makes Breeny More particularly unusual is the setting within which these four examples sit. They are not isolated monuments but are placed inside a multiple-stone circle, positioned in two pairs along the main axis of the circle, closer to the axial stone than to the entrance. That internal arrangement, documented by Ó Nualláin in 1978, suggests a carefully considered spatial logic rather than ad hoc placement. The cover-stones themselves vary in size: the largest, to the west, measures roughly 1.8 metres in length; the smallest, to the east, is about 1.3 metres. Beneath three of the four, low support stones are still visible, ranging from around 15 to 20 centimetres in height. Beneath the eastern boulder, no support stones can be seen at all, though whether they are absent, buried, or simply obscured is not recorded. The whole complex sits on a natural platform in pasture land, which gives the stones a quietly prominent position without any dramatic elevation.