It is sub-rectangular rather than round, stretching roughly 49 metres east to west and 12 metres north to south, and its edges are defined by a scarped drop, where the ground has been deliberately cut or built up to create a clean, deliberate boundary. That scarp varies in width from just over eight metres to nearly seventeen, and the drop in height runs between about half a metre and just under a metre. Slight as that sounds, it is enough to signal that something purposeful once happened here.

The mound sits at the base of a south-facing slope in ground that drains poorly, meaning it would have held moisture across most of the year. Despite that, the position offers clear views in all directions, which may have been precisely the point. Earthen mounds of this kind in Ireland cover a broad range of possible origins, from early medieval enclosures and ringfort annexes to burial mounds, assembly places, or later agricultural platforms, and without excavation it is not possible to say which category this one belongs to. What can be said is that it was recorded and described by Denis Power, with the survey note uploaded in October 2013, and that a north-south field boundary has since been laid across the mound near its western end, which has altered the surface somewhat.

Cullenagh lies within Owneybeg, a barony name derived from the Irish for the territory of the O'Mulryans, in the south of County Limerick. The mound sits in working pasture, so access would depend on the landowner's permission, and the poorly-drained ground means the site is likely to be softer underfoot in wetter months. The most legible feature for a visitor is the scarped edge itself, which is clearest on the long southern side. The field boundary crossing the western end is a useful reference point for orientation, though it also means that portion of the mound reads less clearly as a coherent shape than the eastern section does.