The ground itself shows nothing: no bank, no ditch, no rise or hollow to suggest that anything was ever there. What we know of it comes from a single source, the Ordnance Survey six-inch map of 1904, where a hachured circle, the surveyor's shorthand for a raised or embanked enclosure, marks a roughly twenty-metre-wide feature sitting within a small rectangular field.

Ringforts, known in Irish as raths when they are earthen rather than stone-built, were the typical enclosed farmsteads of early medieval Ireland, dating broadly from the fifth to the twelfth centuries. Thousands survive across the country, but many more have been lost to agriculture, drainage, and the slow work of centuries of ploughing. The Knockantota example appears to have vanished entirely by the time anyone thought to record it beyond a map symbol. The field it occupied measured roughly fifty-one metres east to west and forty metres north to south, which means the enclosure itself would have taken up a substantial portion of that space. That a surveyor in 1904 still found enough visible on the ground to mark it with hachures, yet nothing whatsoever remains today, suggests the site was erased sometime during the twentieth century, most likely by continued agricultural use of the pasture land.