Where a ringfort once rose from a south-facing slope at Knocknageeha, there is now only a slight circular swelling in the pasture, around twenty-two metres across. Ringforts, the enclosed farmsteads of early medieval Ireland typically defined by one or more earthen banks and ditches, were once the most common monument type in the Irish landscape. This one barely registers as a bump in the ground, yet the 1842 Ordnance Survey six-inch map recorded it clearly as a hachured circular enclosure of roughly twenty-five metres in diameter, solid enough in outline to be cartographically legible.

The reason for its near-disappearance is well documented. A source from 1937 records that the ringfort, which sat in a field locally known as Fort Field on land belonging to a man named Tim O'Keeffe, was levelled around 1870 by a former owner named Langley. The deliberate clearing of ringforts for agricultural improvement was not unusual in the nineteenth century, when improving landlords and tenants alike viewed earthen enclosures as obstacles to efficient grazing or tillage. What makes Knocknageeha quietly interesting, though, is its immediate neighbourhood. Within two hundred metres to the north and north-northeast, three further earthworks have been recorded, two confirmed ringforts and one possible example. Four such monuments clustered within a few hundred metres of one another points to a landscape that was once densely settled in the early medieval period, even if most of that settlement is now invisible to any casual eye.