Caher, from the Irish cathair, refers to a stone fort, and its attachment to this patch of ground points to a folk memory of something ancient occupying the slight rise here, even if the structure itself has long since softened into the landscape. What remains is a gently raised, roughly D-shaped platform, around eighteen metres north to south and sixteen metres east to west, ringed on most sides by a low earthen scarp. That scarp, a sloping bank rather than a sharp wall, is the defining feature of a rath, the earthen version of a ringfort, the kind of enclosed farmstead that early medieval Irish families built in their thousands between roughly the fifth and twelfth centuries.

The site was identified through aerial photography, specifically a photograph from the Bruff series, by Caimin O'Brien, whose eye for the subtle geometry these monuments leave on the ground is well practised. Seen from above, the circular logic of the original enclosure becomes legible even where it has been interrupted at ground level. The D-shape visible today is partly a consequence of time and partly of a later field boundary running roughly NNW to ESE, which now defines the monument's edge along its southwestern to northwestern arc, replacing the scarp that has been lost there. The original entrance has not survived in any recognisable form. The interior, which slopes gently southward, is clear of scrub and remains in pasture, sitting atop the southern end of a broad, gently rising ridge from which the ground falls away to the northeast and west.