The example at Tullynagracken, County Sligo, sits in undulating pasture just south-east of the Sligo-Dublin road, and what makes it worth a second look is less spectacle than structural detail. It is a rath, the Irish term for a ringfort built primarily from earth and stone rather than timber palisade, and its oval enclosure measures roughly 25 metres north to south and 32 metres east to west.

The boundary is formed in two distinct ways. To the north and north-east, an earth and stone bank survives, standing only about 20 centimetres above the interior ground level but rising to nearly a metre on the outside, with a width of around 1.6 metres. From the north-east round to the south-west, the enclosure is defined instead by a natural or cut scarp, a steep slope in the ground, standing about 1.27 metres high. Notably, there is no fosse, the external ditch that typically accompanies such banks and helps explain how the material was piled up in the first place. Its absence here suggests either that the builders worked with the existing contours of the land rather than excavating fresh material, or that any ditch has long since been filled and levelled. The entrance, 3.6 metres wide, opens to the north.