At Straghan in County Monaghan, a ringfort once occupied the summit of a drumlin, one of those smooth, whale-backed hills of glacial till that give the Monaghan landscape its distinctive rumpled character. When it was recorded in 1968, the fort presented a fairly legible plan: a circular enclosure roughly 27 metres across, defined by an earthen bank and an outer fosse, which is a defensive ditch. Someone had at some point re-cut that ditch to serve as a land drain, a fate common to earthworks across Ireland as agricultural pressure mounted. The probable original entrance lay on the east-south-east side, where a causeway crossed the fosse at a width of about four metres, with a narrow gap at its base just wide enough for a single person or animal to pass through.

Ringforts of this kind are among the most numerous archaeological monuments in Ireland, with tens of thousands recorded across the island. Most date to the early medieval period, roughly the fifth to twelfth centuries, and functioned as enclosed farmsteads, the earthen bank and ditch offering a degree of protection for livestock as much as for people. The Straghan example was modest by any measure, its bank standing less than two metres high on the exterior face, its interior no larger than a generous farmyard. What made its position on a drumlin summit characteristic is the way such elevated spots offered both visibility and drainage, practical advantages that early farmers would have valued as much as any sense of prestige. By 1995, however, the monument had been removed entirely, leaving only the 1968 description as evidence that it ever stood there.