The largest and central of the group, it measures just 4.2 metres by 4.4 metres and stands only 0.4 metres high, meaning it would be easy to walk past without a second glance. That quietness is, in a way, the point. Mounds of this kind often escape casual notice precisely because they have settled so thoroughly into their surroundings over centuries, or longer.

The three mounds at Rathoran were recorded by Toal in 1995, catalogued among the many low earthworks that punctuate the Kerry landscape. What exactly these mounds represent, whether burial monuments, field clearance heaps, or something else entirely, is not specified in the available record, and that ambiguity is itself worth sitting with. Kerry is dense with prehistoric and early medieval earthworks, and clusters of mounds in close proximity sometimes indicate a funerary or ritual landscape, where the placement of each feature in relation to the others carried meaning that is now largely lost to us.