A ringfort, or rath, is a circular or near-circular enclosure defined by one or more earthen banks and ditches, typically dating from the early medieval period and used as a defended farmstead. This one, roughly 40 metres in diameter according to its outline on the 1935 Ordnance Survey six-inch map, was once considerably more imposing than what survives today.

Writing in 1904, a chronicler named Healy described the site as being of very great size, noting that some of its embankments stood no less than twelve feet high, even as a large portion had already disappeared by that point. By 1990, when local researcher Vincent MacMahon visited, what remained was a low earthen bank running along the north-east and east sides of the enclosure. MacMahon noted that locals regarded this north-eastern stretch as a remnant of the original ringfort bank, a piece of accumulated local memory that, while not archaeological proof, is rarely without some basis. The interior of the enclosure has since been largely damaged or built over by the development of a private marina, which has ensured that what Healy could still observe in the early twentieth century is now effectively inaccessible to further study or casual inspection.