The earthen bank that once enclosed a farming settlement at Scartnamuck has been absorbed into the local field fence system to the east, while a dry-stone wall caps its western side, giving the whole thing the appearance of an ordinary agricultural boundary rather than a structure potentially fifteen hundred years old. That assimilation into the working landscape is what makes it easy to overlook, and what makes it worth pausing over.

The site is a rath, the most common type of enclosed settlement in early medieval Ireland, typically dating from roughly the sixth to the twelfth century. A rath consists of a roughly circular area surrounded by one or more earthen banks with a corresponding external ditch, known as a fosse. At Scartnamuck, the enclosed area measures approximately 37.9 metres north to south and 35 metres east to west, making it a reasonably substantial example. The bank stands 1.4 metres high, is stone-faced, and is accompanied by an external fosse some 0.6 metres deep along the southern and south-eastern arc. A gap in the eastern side likely marks the original entrance. The fort sits in pasture ground with Castlenalact Lake visible to the south-east, a position that would have offered its original occupants a clear view across the surrounding land, a practical consideration for a farming household in an era when cattle-raiding was a fact of life.