This is a cashel, a type of ringfort defined by a drystone wall rather than an earthen bank, and the one at Caheraderry is a reasonably substantial example: roughly subcircular in plan, with an interior measuring about 26.5 metres north to south and 26 metres east to west, and a wall that still stands up to two metres on its outer face in places. What makes it quietly odd is the angular northeastern quadrant, a section of walling that breaks the otherwise curved outline in a way that sets it apart from the typical form.

The wall itself tells a story of how it was built and how it has aged. The lower courses are laid with large stones, the upper courses with smaller ones, a construction method that reflects the practical logic of dry-stone work. At its base the wall runs to about two metres wide, narrowing slightly towards the top. Around the outside, a spread of collapsed rubble, between one and two metres across, marks where sections have fallen outward over the centuries. The site was already recorded by the time the Ordnance Survey produced its first detailed six-inch mapping of Ireland in 1840, appearing on that map with hachuring to indicate the enclosure's form. The western side is now entirely overgrown, and four cattle gaps cut through the wall at various points, all of them modern insertions. The original entrance has not been identified.

The interior slopes gently down towards the southeast and offers nothing visible at ground level, no souterrains, no traces of structures, nothing that breaks the surface. The panoramic views that the ridge position would logically command are largely blocked by the same dense vegetation that obscures the monument itself, which gives the whole site a somewhat sealed-off quality, present but not especially yielding to inspection.