The barrow at Dromin South appeared on no Ordnance Survey historic map, and it was only when an aerial photographic survey was carried out over the Bruff area in 1986 that the site was recognised at all, identified from above as a distinct enclosure in the pasture just north of the stream that marks the boundary between Dromin South and the neighbouring townland of Cloonygarra.

A barrow, in the Irish archaeological sense, is broadly a burial mound or earthwork of prehistoric or early medieval origin, and this one conforms to the type without being entirely straightforward about it. When the Archaeological Survey of Ireland came to survey the site in 1996, they recorded a raised, roughly circular platform about eighteen metres across, enclosed by a low earthen bank some three metres wide and only a quarter of a metre high on its better-preserved north-east to south-west arc, reduced elsewhere to little more than a scarp in the ground. Inside, the surface rises gently towards the north-east, where a smaller sub-circular mound, about four metres in diameter, sits with a shallow central depression measuring just over a metre wide and twenty centimetres deep. That depression may hint at earlier disturbance or partial excavation, though the record is silent on the matter. The monument has since shown up in other forms of remote sensing: as a raised circular platform in Ordnance Survey orthophotos taken between 2005 and 2012, and as a faint cropmark, the outline of an enclosing fosse just visible from orbit, in Google Earth imagery.

The site sits in wet pasture, which means ground conditions matter considerably. The stream nearby keeps the surrounding land soft for much of the year, and the monument itself, modest in height, can be easy to miss underfoot even when you know roughly where to stand. The low bank is most legible on the north-east side; elsewhere it merges gradually into the surrounding field. The ASI sketch plan compiled alongside the 1986 aerial photograph and the satellite imagery offers the clearest orientation for anyone wanting to locate the feature on the ground. Given how slight the earthworks are, the aerial and satellite views remain, in some ways, the most useful means of appreciating the monument's shape and scale.