The one at Doonis is modest in scale, roughly 26 metres across, but its position on the slope gives it wide views across the surrounding countryside to the north, east, and south, the kind of outlook that would have mattered enormously to the families who once lived inside it.

A ringfort, or rath, is essentially a circular enclosure defined by one or more earthen banks, originally used as a farmstead or dwelling during the early medieval period, broadly between the fifth and twelfth centuries. At Doonis, the enclosing bank is wide but low, built from earth and stone, and accompanied by a shallow external fosse, a defensive ditch dug around the outside. That fosse is only legible now at the western and northern edges; the rest has been worn or silted away over the centuries. There is an original entrance gap in the eastern side of the bank, which would have faced the open hillside and the morning light. Two neighbouring ringforts lie close by, one approximately 150 metres to the north and another around 100 metres to the south-west, suggesting this was not an isolated farmstead but part of a broader pattern of early settlement across the hill.

The interior of the enclosure slopes noticeably from west to east, following the natural contour of the hillside. Field fences, laid down in more recent centuries, now cut across the monument at all four compass points, dividing what was once a single defined space into sections of modern farmland. That intersection of old and new is quietly telling: the ringfort has not been cleared or preserved in isolation but has simply been absorbed into the working landscape around it.