What is known of it comes almost entirely from maps and aerial photography: its oval outline shows up on a Digital Globe image taken in November 2011, a ghostly impression persisting beneath or among the trees.

The site was marked as a 'fort' on the 1837 Ordnance Survey Fair Plan map and depicted on the first edition six-inch OS map of the same year as an oval-shaped enclosure, the standard cartographic shorthand for a ringfort. Ringforts, which are the most common field monument in Ireland, are typically circular or oval earthen enclosures built during the early medieval period, used as farmsteads and defended homesteads. This one in Tober is not alone in its landscape: a second ringfort lies roughly 250 metres to the north-east, suggesting the kind of dispersed but clustered settlement pattern that was common across early medieval Ireland. The tree plantation that now surrounds the Tober fort is something of an accidental preservative, keeping the ground undisturbed while also making direct examination impossible.