St Erc was a fifth-century bishop associated with Slane, County Meath, and is traditionally identified as one of the earliest disciples of St Patrick. His connections to Kerry are less well documented, but the place-name and the local tradition that clings to this site suggest a long memory. The mound itself is stone-built beneath its grassy covering, irregular in plan, measuring roughly 28 metres north to south and 18 metres east to west, and rising to about 2.2 metres above the surrounding land. Two depressions mark the interior: an oval hollow in the western sector, around 6 metres long and notably deep, and a shallower circular depression to its south-east. Radiating outward from the structure are two earthen banks, one extending from the south-east sector and another curving away from the south-west end before turning south, giving the whole monument a slightly tentacular outline when seen from above. These external banks are a feature worth noting; they suggest the mound was once part of a larger enclosure or ceremonial arrangement, though exactly what that arrangement looked like is not recorded.