A roughly circular enclosure in Ardgoulbeg, County Limerick, sits atop a limestone crag on a break in a west-facing slope, its ancient bank so low and worn in places that it barely announces itself to the eye. This is a rath, the Irish term for a ringfort, the type of enclosed farmstead that once dotted the early medieval landscape in extraordinary numbers across Ireland, typically dating from around the fifth to the twelfth centuries. Most were built by farming families of modest means, their earthen banks defining a protected yard for livestock and a dwelling or two within. Here, the enclosure measures roughly 27.7 metres north to south and 26.7 metres east to west, dimensions consistent with a single-family settlement rather than anything of regional importance.

The bank itself is a composite of earth and stone, standing only 0.35 metres above the interior and 0.55 metres above the exterior ground level, which suggests either considerable weathering over the centuries or a structure that was never especially ambitious to begin with. What complicates the reading of the site is a dry-stone wall, standing 0.9 metres high and 0.65 metres wide, which runs along the top of the bank from the south-east toward the north-west. This wall is not original to the ringfort but forms part of the surrounding field boundary system, meaning later agricultural use has effectively grafted itself onto the earlier monument. A low limestone ridge also extends outward from the northern face of the bank for approximately 14 metres before fading into the ground, possibly a natural geological feature of the crag that was incorporated into the enclosure's design. The site was recorded by Denis Power and uploaded to the national record in August 2011.

The interior slopes gently downward toward the east and is under pasture, though mature beech trees line its fringes and give the enclosure a quietly enclosed quality even without a commanding earthwork to define it. The bank is at its most indistinct along the northern to south-eastern arc, so the clearest sense of the original circuit comes from the southern and western sides, where the field wall reinforces the line of the bank. The site sits on private farmland, so any visit would require appropriate permissions. Those who do reach it should look for the point where the limestone crag breaks the surface, and trace how the bank and the later wall relate to one another; the two systems occupy the same ground but belong to entirely different worlds of land use.