Part of the earthen bank enclosing this ringfort at Derraulin has been quietly absorbed into the surrounding field system, so that what reads from a distance as an ordinary agricultural boundary is, in fact, the surviving wall of an early medieval enclosure that predates the fields around it by well over a thousand years.

Ringforts, known in Irish as raths, were the most common form of settlement in early medieval Ireland, typically dating from roughly the fifth to the twelfth centuries. They served as enclosed farmsteads, the earthen bank providing a degree of security for a family and their livestock against both human threat and wandering animals. The example at Derraulin sits on a gentle rise in undulating pasture land, and its circular interior measures approximately twenty-five metres in diameter. The enclosing bank still stands to an external height of around 1.45 metres, which is a reasonable degree of survival for an earthwork of this age. The fact that the bank runs from east-southeast to west-northwest into the modern field boundary suggests the landscape has been reorganised around it over the centuries, with the ringfort effectively press-ganged into service as a convenient dividing line between fields.

The interior presents a more impenetrable prospect. A dense cover of briars and bushes has colonised the enclosed area entirely, which is both a barrier to exploration and, in its own way, a form of preservation; vegetation of this kind tends to discourage the casual disturbance that more accessible sites sometimes suffer. Visitors with an interest in early medieval settlement patterns will find the earthwork most legible from the outside, walking the line of the bank to appreciate its scale and the gentle elevation on which it sits. The site is in pasture, so land access would require the landowner's permission. Denis Power compiled the record, which was uploaded in August 2011.