There is nothing left to see; the earthwork has been levelled, and no surface trace remains. What makes this site worth pausing over is precisely that erasure, and the paper trail of maps that documents it happening gradually over the course of nearly a century.

A ringfort, or rath, is a type of enclosed farmstead dating broadly from the early medieval period, typically consisting of a circular bank and ditch enclosing a domestic space. The Ballynahina example appears on the 1842 Ordnance Survey six-inch map, though not yet as the round form most people associate with such sites; it is shown as a sub-rectangular area planted with trees, suggesting the earthwork was already being managed or obscured by that point. By the time the 1903 and 1935 OS maps were produced, it is recorded as a circular area roughly thirty metres in diameter. The antiquarian John Windele, writing in 1897, noted a fort on Corrin ridge to the west that looked down on Ballinahina, which he identified as Barry's place, suggesting the site was still recognisable, at least in outline, at that date. At some point after 1935, it was levelled completely, its location now absorbed into a golf course on the ESE-facing slope of the ridge.