A short stretch of low earthen bank, running roughly from north-northeast to east, is about all that remains visible, along with a slightly raised and much-levelled area it once enclosed. For those who know what to look for, the ghost of the perimeter can still be traced from the west-southwest around through north to north-northeast, the curve of an ancient boundary half-absorbed into the landscape around it.

This is a rath, the Irish term for a ringfort, a type of enclosed farmstead that was the standard unit of rural settlement across early medieval Ireland, broadly from the sixth to the twelfth century. Ringforts were typically circular earthworks defined by one or more banks and ditches, enclosing a dwelling and associated outbuildings. The Drumauna example was significant enough to be recorded as simply 'Fort' on the Ordnance Survey maps of both 1836 and 1876, suggesting it was a recognisable feature of the local landscape well into the nineteenth century, even as agricultural activity gradually smoothed it down. The positioning on a drumlin summit, a drumlin being one of the smooth oval hills left behind by glacial drift and particularly common across counties Cavan and Monaghan, would have been a deliberate choice, offering clear sightlines in most directions.