The combination is not unheard of in Irish archaeology, but it is uncommon enough to give a visitor pause.

A rath, as ringforts of this earthen type are sometimes called, is an enclosed farmstead of the early medieval period, typically defined by a circular bank and an outer ditch, known as a fosse, designed to protect a household and its livestock. The example at Cappagh sits on a gentle rise in pastureland, with bog lying about 250 metres to the west, and measures roughly 37 metres north to south and 39 metres east to west. The enclosing bank is poorly preserved for much of its circuit but survives with more clarity along the south, west, and north-north-west arc. A gap on the eastern side is the likely position of the original entrance. Inside, the ground slopes slightly from north to south, and faint traces of old cultivation ridges are still legible across the surface, suggesting the interior was worked as agricultural ground at some stage, possibly well after the fort's original use had ended. The standing stone sits in the south-west quadrant of the interior. Whether it predates the ringfort, was incorporated into it deliberately, or arrived there by some later arrangement is not recorded, but its presence adds a layer of uncertainty to what might otherwise seem a straightforward early medieval enclosure. A second ringfort lies approximately 400 metres to the north-west, a reminder that this kind of settlement was never as isolated as the modern landscape might suggest.