The fort at Tullovin does neither. Instead, it was built hard against the southern bank of the River Maigue, on what is now reclaimed flat pasture, its back to the water and its curved earthworks facing out across the floodplain. That positioning alone marks it out as an oddity, one that specialists have noted has more in common with a single comparable site elsewhere in the county than with the broad run of local ringforts.

A ringfort, in general terms, is a roughly circular enclosure defined by one or more earthen banks and ditches, used in early medieval Ireland as a farmstead or defended homestead. The Tullovin example appears on the 1840 edition of the Ordnance Survey six-inch map as a D-shaped field enclosure, which suggests its outline was still legible in the landscape at that point. By the time the more detailed 25-inch OS map was produced in 1897, the record is clearer: an embanked D-shaped fort with external dimensions of roughly 26 metres northeast to southwest and 29 metres northwest to southeast, backing directly onto the Maigue, with a curving ditch and external bank some 8 metres wide and 45 metres long running to the southwest. The D-shape itself is the telling detail, the straight edge formed by the riverbank, with the earthworks completing the circuit on the landward side.

What makes the site particularly interesting to researchers now is how much of it has since disappeared. Aerial orthoimages taken between 2005 and 2013 show nothing of the monument at all, most likely because ground-level features have been ploughed or levelled over decades of agricultural use on the reclaimed pasture. Only partial traces reappear on Google Earth images from March 2016, June 2018, and February 2020, visible under certain light and crop conditions. For anyone curious enough to visit, the site lies on private farmland adjacent to the Maigue, and there is no public access or on-site interpretation. The earthworks, where they survive, would not be obvious to the untrained eye. The record compiled by Edmond O'Donovan in October 2020, drawing on those intermittent aerial glimpses, may ultimately preserve more of this fort than the ground itself does.