Most raths, as these early medieval earthwork enclosures are commonly known, were built on elevated ground where the occupants could see trouble coming; this one in Freneystown, Co. Kilkenny, occupies a more ambiguous position, on the eastern flank of only slightly rising ground, as if the builders made a careful compromise between drainage and visibility and accepted the soggy ground as the price.

The enclosure itself is nearly circular, measuring 38 metres north to south and 37 metres east to west, figures that place it comfortably within the typical range for a single-family rath of the early medieval period, roughly the fifth to twelfth centuries. The surrounding bank, which is the defining feature of this class of monument, rises to at least a metre on the interior side and at least a metre and a half on the exterior, with an overall width of three and a half metres at its base and one metre at the crest. A gap of two metres in the south-east quadrant marks what was likely the original entrance. The interior slopes noticeably downward toward the east, which may partly explain the marshy conditions underfoot. The bank itself is now heavily colonised by thorn bushes, a common fate for these earthworks once agricultural management relaxes around them, and one that paradoxically helps preserve the underlying structure by discouraging disturbance.