This ringfort, or cashel as these stone-built fortifications are known in Ireland, forms a roughly circular area measuring between 20 and 30 metres in internal diameter. The structure follows the natural gradient of the hillside, with the interior sloping downwards from north to south.

The enclosing wall, though now largely reduced to a low, grassed-over stony bank, once stood as a formidable barrier around this early medieval homestead. Where the basal layers of the original wall survive, particularly along the northern side, measurements reveal it was a substantial construction at 2.15 metres wide. Such thick walls were typical of cashels, providing both defence and shelter from the elements in this exposed hillside location.

This archaeological site represents one of thousands of similar ringforts scattered across the Irish landscape, most dating from the early medieval period between roughly 500 and 1200 AD. These circular fortified farmsteads served as the homes of prosperous farmers and their extended families, offering protection for both people and livestock. The choice of location on Lehardan Hill, whilst challenging for modern access, would have provided the original inhabitants with commanding views across the surrounding countryside; an important consideration in an age when advance warning of approaching visitors, whether friendly or hostile, could prove vital.