The ringfort at Lackendarragh is a rath, a type of circular enclosure typically built during the first millennium AD as a defended farmstead for a single family or small agricultural community. What makes this one quietly interesting is the consistency with which it has been recorded across nearly a century of mapping. The Ordnance Survey captured it as a hachured circular enclosure on its six-inch maps in 1842, again in 1905, and once more in 1938, each survey confirming that the form was still legible in the landscape.

The enclosure measures approximately 43 metres in diameter, and a substantial arc of its bank survives running from north round to south-southwest. The bank itself is earthen and stone-faced, standing to about 1.2 metres both internally and externally for much of its arc, with a slightly more pronounced earthen bank of 1.6 metres toward the south-southwest section. The interior slopes downward to the west, following the natural gradient of the hillside. One of the more telling details is how the bank has been absorbed into the field fence system at the northeast and south; a practical accommodation that has probably helped preserve those sections by giving them an ongoing agricultural purpose rather than leaving them as purely archaeological residue. An aerial photograph taken in July 1975 confirmed the enclosure still visible from above as a clear upstanding circle in the field.