The platform measures thirty-four metres across and rises about a metre above the surrounding ground, with banks at the north and west still standing to an internal height of one and a half metres. What makes it slightly puzzling is the absence of any identifiable original entrance, external fosse, or internal features. A gap exists at the west, but it appears to be recent rather than a surviving threshold from the structure's working life.

This is a rath, the Irish term for a ringfort, the most common monument type surviving in the Irish countryside. Ringforts served as enclosed farmsteads during the early medieval period, roughly the fifth to the twelfth centuries, and would typically have sheltered a family, their livestock, and associated outbuildings within a bank and ditch arrangement. The ditch, or fosse, would ordinarily sit outside the bank, giving the enclosure both a physical and symbolic boundary. At Boleylug, that fosse is absent, which may reflect the site's particular construction history, its setting on sloping ground, or simply the degree to which the original fabric has been altered. The drystone facing on the surviving banks is noted as at least partly recent, suggesting the earthwork has been modified or repaired at some point after its original construction, though when that happened and by whom is not recorded.