No earthwork survives above the soil, no wall or bank breaks the surface. What gives the site away is a cropmark, the kind of ghostly outline that appears in aerial imagery when buried ditches and features cause overlying crops to grow differently, revealing ancient geometry to anyone looking down from above.

The enclosure was identified in 2018 by Jean-Charles Caillère, Simon Dowling, and Edward O'Riordan, working from Google Earth Pro satellite imagery captured on 14 July of that year. What they found is a D-shaped form, roughly 50 metres across both north to south and east to west, with a notably straight western side running approximately 34 metres. The boundary is defined by a wide fosse, which is simply a ditch, typically dug to demarcate or defend an enclosed area. A possible entrance, around 3 metres wide, appears in the north-eastern quadrant of the circuit. The D-shape is a form that appears across Ireland in a range of contexts, from early medieval ringforts to prehistoric enclosures, and without excavation it is difficult to assign a precise date or function to the Neigham example. What can be said is that the site is substantial and that its proportions suggest a deliberate, organised use of space at some point in the deep past of this corner of County Kilkenny.