At Knockballyfookeen, a townland whose name alone invites a second glance, a rath sits quietly on a gentle north-east-facing slope just ten metres or so from the Reask River, which here marks the boundary with the neighbouring townland of Cross. The enclosure is oval rather than perfectly round, measuring roughly 24 metres north to south and 17 metres east to west, and the earthworks around it are considerably more substantial than a first glance from the interior might suggest.

A ringfort, or rath, is an enclosed farmstead, typically dating from the early medieval period, roughly 500 to 1000 AD, in which a family and their livestock lived within a circular or oval bank and ditch for both security and status. When the Archaeological Survey of Ireland recorded this example in 2008, their survey revealed a layered defensive arrangement that is still largely legible in the landscape. The main enclosing bank, built of earth and stone, stands just 0.35 metres above the interior but rises to a more imposing 2.05 metres on the outside, with a width of 8.4 metres through the body of the bank itself. On the northern and north-eastern arc it has been reduced to a scarp reaching 2.75 metres. Beyond this lies a fosse, the formal term for the accompanying ditch, nearly ten metres wide overall with a base width of 4.6 metres and a depth of just over a metre. Outside that, traces of a second, outer bank survive, though only on the south-south-west to north-west portion of the circuit. The original entrance appears to have been on the west side, where a gap 3.5 metres wide is recorded. A field drain cutting across the south-south-west has truncated part of the outer bank, a small but telling reminder of how agricultural improvement over the centuries can quietly alter ancient boundaries.

The interior today is planted with mature beech trees and self-seeded thorn, which together give the monument its distinctively wooded profile when seen from a distance. That canopy makes the site identifiable on aerial imagery, including Digital Globe orthophotos from 2011 to 2013 and a Google Earth image from June 2018. The surrounding land is gently undulating pasture, and the Reask River running close by to the north-east offers a useful orientation point. The survey record, compiled by Alison McQueen and Vera Rahilly and uploaded in July 2020, includes detailed plans and cross-sections produced by the ASI, which reward closer study for anyone interested in the engineering logic of these enclosures.