That compressed, hemmed-in quality is part of what makes it worth attention. The enclosing bank still rises to 2.2 metres on the outside and the ground inside sits at a slightly higher level than the surrounding land, a subtle inversion that speaks to how carefully these structures were engineered. A gap two metres wide on the western side marks the original entrance, still the way in.

The site is a univallate rath, meaning it is enclosed by a single bank and ditch rather than the multiple concentric rings found at more elaborate examples. A rath is an early medieval farmstead enclosure, most commonly associated with the period between roughly the fifth and twelfth centuries, when they served as the defended homesteads of farming families across Ireland. At Knoppoge, the enclosing bank averages 4.6 metres in width and is composed of both earth and stone. Most of the external fosse, the ditch dug to reinforce the bank, remains visible, running to about 1.8 metres wide and sitting roughly 0.7 metres below the level of the surrounding ground. Only to the north and north-east does it become hard to trace. One detail recorded in C. Toal's North Kerry Archaeological Survey of 1995 is particularly telling: in the eastern sector, the interior face of the bank is stone-lined for a stretch of 4.2 metres, a small piece of deliberate construction that suggests the people who built this place were working with some care and with materials close to hand.