What makes it quietly notable is the way the landscape itself seems to have been incorporated as a deliberate part of the design: along the eastern side, the ground drops away sharply, a two-metre fall into a wide, deep ravine that effectively replaces the need for a man-made barrier on that flank.

The enclosure measures approximately 39 metres north to south and 40 metres east to west, defined by an earthen bank and an accompanying fosse, the trench dug alongside a ringfort's bank to deepen the sense of enclosure and make approach more difficult. The bank itself is around two and a half metres wide; on the interior it still stands close to two metres above the concave floor, though on the exterior it has been worn down to little more than half a metre. That asymmetry is typical of earthworks that have weathered over a millennium or more of agricultural use. The interior slopes gently southward, and the bank shows clear signs of damage: truncated at the east and south, considerably eroded at the north, with gaps at the south-east and north that may reflect original entrances, later breaches, or both. Ringforts of this kind, known in Irish as raths, were the most common settlement form in early medieval Ireland, typically enclosing a farming household and its associated structures between roughly the fifth and twelfth centuries. Thousands survive across the country in varying states of preservation, though few sit quite so deliberately beside a natural ravine as this one on Knigh Hill.