The elevated position, built on poorly drained land, features a rectangular raised area measuring 28 metres from northwest to southeast. This central space is enclosed by a substantial earth and stone bank, roughly 2 metres wide, which rises about 25 centimetres on the inner side and a full metre on the outer edge. Beyond this protective barrier lies an external ditch, or fosse, measuring 2.5 metres across and half a metre deep.

Today, heavy overgrowth has claimed much of the interior, making detailed examination challenging for researchers attempting to unlock the site’s secrets. The combination of the raised platform, enclosing bank, and surrounding ditch suggests this could be a medieval moated site; a type of fortified homestead typically associated with Anglo-Norman settlers in Ireland from the 13th to 15th centuries. These sites often served as defended farmsteads for wealthy landowners, offering both status and security in the medieval landscape.

However, the site’s true nature remains open to interpretation. The depiction on historical Ordnance Survey 6-inch maps hints at an alternative possibility; that this might be a nineteenth-century enclosure rather than a medieval structure. Such enclosures were common during the agricultural improvements of the 1800s, when landowners reorganised field systems and created new boundaries. Until the vegetation can be cleared and proper excavation undertaken, Knockagh keeps its secrets, leaving visitors to imagine whether they’re standing at a medieval stronghold or a more recent agricultural feature.