That designation carries weight. In Irish landscape terms, a fort of this kind almost certainly refers to a ringfort, a type of enclosed farmstead that was the dominant form of rural settlement from the early medieval period through to around the twelfth century. Tens of thousands once dotted the Irish countryside, and while many have been ploughed out or built over, this one at Drumganus has survived in a quietly altered form.

The enclosure measures roughly 35 metres across from northwest to southeast, and when the Ordnance Survey first mapped it in 1834, it appeared as a clearly defined embanked circle with an external diameter of around 40 metres. By the time the revised edition appeared in 1907, much of that definition had been absorbed into the working fabric of the farm: what had been a distinct earthwork was by then recorded simply as a curve in a field bank running from southeast through west to northwest. The old boundary had, in effect, been quietly conscripted into the field system around it. Yet inside the line of that bank, a low earthen bank still survives, roughly three metres wide and a quarter of a metre high, running from west to north. It is modest, easy to miss, but it is what remains of the original enclosing wall.

The drumlin ridge itself shapes how the site sits in the landscape. Drumlins, the smooth egg-shaped hills formed by glacial deposits, are a defining feature of this part of Ulster, and the southern end of such a ridge would have offered a degree of elevation and visibility, practical advantages for whoever built and worked within this enclosure well over a thousand years ago. What looks today like a slightly irregular field edge is, on closer inspection, a compressed record of the place's long use.