Dating back to the Late Bronze Age, this impressive defensive site consists of two concentric rings of embankments that enclose a massive 20.5 hectares of hilltop terrain. The inner ring forms a roughly circular area about 300 metres across, whilst the outer defences run between 80 and 120 metres beyond it, creating a formidable multi-layered fortification that would have dominated the surrounding landscape.

The construction of these ancient earthworks shows considerable engineering skill. Both rings follow a similar design, featuring an internal bank paired with an external ditch and counterscarp bank, though the inner defences are more substantial. These earthen ramparts, now buried beneath 30 centimetres of peat and covered in heather and gorse, originally stood about 75 centimetres high with ditches of similar depth. At least three entrances pierce the inner enclosure; a simple causeway break at the southeast, another at the west, and a more elaborate northeastern entrance where excavations revealed large postholes flanking the gap, suggesting this was once secured by a wooden gate.

Recent archaeological investigations have added fascinating details to our understanding of the site. Geophysical surveys detected clusters of possible pit features within the eastern section of the fort, whilst targeted excavations in 2012 confirmed the Late Bronze Age origins of the fortifications through radiocarbon dating of material from the base of both enclosing ditches. The hilltop location on a partial spur of a north-south running escarpment provided the fort's inhabitants with panoramic visibility from northeast to south, making it an ideal defensive position and a powerful statement of control over this part of ancient Limerick.