The earthen bank that defines it is modest by any measure, rising less than a metre on the interior side and just a little more on the exterior, yet it has survived in recognisable form through centuries of farming, forestry, and general indifference to the past. A few deciduous trees still stand inside the enclosure, along with the stumps of others that did not.

This is a rath, the most common form of early medieval settlement in Ireland, typically consisting of a circular area enclosed by one or more earthen banks and ditches, and most likely the farmstead of a family of some local standing. The Drumcrew example measures roughly 33.5 metres north to south and 31.5 metres east to west, with a single entrance gap, three metres wide, opening to the south-south-east, though that entrance is now closed off. Faint traces of an external fosse, a shallow defensive ditch, survive at the north-east, east-south-east, and south-west. The site was already considered worthy of recording by the time William McCrea produced his map of County Monaghan in 1793, and it appears again on the Ordnance Survey six-inch editions of 1834 and 1907, which means at least two centuries of cartographers found it sufficiently distinct to mark. That kind of documentary continuity is part of what makes a site like this quietly interesting: the landscape changed around it, but the ring itself persisted, legible enough to keep finding its way onto paper.