The one at Drum, in County Sligo, is a little more awkward than that. Its outline is roughly D-shaped, the bank curving on one side and running in two straight sections on the other, those straight portions meeting at a right angle at the south-west corner. It is the kind of irregularity that suggests the builders were working around something, perhaps the lie of the land, perhaps an earlier boundary, though the site itself does not say.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more earthen banks and a surrounding ditch. The Drum example sits on a very slight north-north-east-facing slope in what is now wet pasture, the ground gently undulating around it. The enclosure measures roughly 26 metres north to south and 25 metres east to west, making it a modest enough example. Its bank of earth and stone is narrow, about 2.9 metres wide internally and only 0.3 metres high, so time and agriculture have worn it considerably. Outside the bank runs a fosse, a defensive ditch, 3.6 metres wide, though on the south-west to north-west arc it has silted up almost entirely. There is also a faint trace of what may be a second, outer bank along the northern and south-eastern side, though it is too indistinct to be certain of its original extent or purpose. What is not visible at all is the original entrance; wherever people once passed in and out of this enclosure, that threshold has been erased.