The site consists of a raised circular enclosure measuring approximately 38.5 metres north to south and 34 metres east to west, positioned strategically about 100 metres south of Lyonstown Castle proper. This proximity suggests the two fortifications likely worked in tandem as part of a broader defensive network during the medieval period.

The ringwork’s defences are particularly well-preserved along its eastern, southern and western sides, where visitors can still trace the original triple-ring defensive system. The main rampart, constructed with a high stone content, stands 5.3 metres wide and rises to an impressive 3.05 metres on its exterior face, whilst the interior height measures 0.86 metres. Beyond this primary defence lies a fosse, or defensive ditch, measuring 2.8 metres wide and 2.07 metres deep, followed by an outer bank of similar width that stands 0.7 metres high on its external side.

Two gaps breach the inner bank, offering clues about how the site was accessed and used. The larger opening in the southern quadrant spans approximately 5.5 metres, though the outer bank appears disturbed in this area, possibly indicating later modification or damage. A narrower 2-metre gap in the northwest quadrant may have served as a secondary entrance or postern gate. These earthworks, compiled and documented by researcher Jean Farrelly in August 2011, provide valuable insight into how the Anglo-Normans adapted and fortified the Irish landscape following their arrival in the 12th century.