The raised ground is only marginally higher than its surroundings, yet the geometry beneath the grass is deliberate and old. This is a rath, the Irish term for a ringfort, a type of enclosed farmstead built across Ireland roughly between the early medieval period and the early Norman era, typically serving as a defended homestead for a farming family of some local standing.

The site takes the form of a roughly circular area about 28 metres in diameter, enclosed by an inner bank of earth and stone some six metres wide, though it rises only 0.3 metres above the interior. Beyond that inner bank lies a berm, a flat ledge of cleared ground about four metres wide, and then a second, outer bank, narrower at two metres across and slightly taller on its inner face. This double-bank arrangement, where an inner enclosure is separated from an outer one by a berm, is a feature associated with more elaborate ringfort construction, sometimes described as a multivallate design. At Doonally, however, the outer bank and berm are only visible along the south-east to north-west arc of the site; elsewhere they have either been absorbed back into the ground or were never continued. A small section of the inner bank was quarried away at the north-east at some point, but the original entrance survives on the eastern side, a deliberate gap of about 2.4 metres through the inner bank, oriented toward the rising sun in a way common to many Irish ringforts.

What makes this particular site quietly compelling is precisely its modesty. The banks are low, the rise barely perceptible, and much of the outer earthwork has effectively vanished at ground level. It is the kind of place that rewards slow attention, the gradual realisation that the slight swell in the field has a shape, and that the shape has an entrance, and that someone once passed through it every day.