The earthworks at Clonygrange in County Meath were only confirmed through aerial photography, which picked out the subtle marks of a monument that had quietly escaped the cartographers altogether. That omission is itself a reminder of how many such sites remain imperfectly recorded across the Irish landscape.

A ringfort, or rath, is an enclosed farmstead of the early medieval period, typically defined by one or more earthen banks and ditches and used as a defended homestead rather than a military fortification. The Clonygrange example is subcircular in plan, measuring roughly 64 metres west-northwest to east-southeast and 56 metres north-northeast to south-southwest, making it a reasonably substantial example of the type. Its defining earthwork is an inner bank, which on the western side still stands to an external height of around two metres with a base width of six and a half metres. This is separated from an outer bank by a fosse, the ditch between them measuring nearly five metres across at the top. The outer bank is now thought to function largely as a field boundary rather than a formal defensive element, and it has been considerably eroded or lost entirely along the northern and eastern arcs. A wide entrance gap, six metres across, survives at the north. Complicating matters is a small stream to the south, which has been canalised at some point and now cuts across both the inner and outer banks on the southern and southwestern sides, truncating the earthworks and distorting what was once a more complete circuit.