The depression, roughly six and a half metres long and just over a metre deep, is all that remains of a souterrain, an underground stone-lined passage or chamber typically built during the early medieval period, often as a place of refuge or storage within a ringfort. A few fragments of its original drystone lining still cling to the sides, but the structure has otherwise collapsed in on itself, leaving little to see above ground.

The site sits within a ringfort, a circular enclosed settlement of the kind that was common across Ireland from roughly the fifth to the twelfth centuries. What sets this particular spot apart is its local name and the story attached to it. The feature is known as Poll Dominic, a name recorded by An Seabhac in 1939, and it carries a persistent reputation as the hiding place of gold belonging to a highwayman. Whether the name Dominic refers to the highwayman himself or to some earlier association is not recorded. Nearby, set into the outer bank of the ringfort's ditch on the northern side, there is a small D-shaped drystone chamber that may be a comparatively recent animal shelter rather than anything of medieval origin, a reminder that these old enclosures were often reused for entirely practical purposes long after their original inhabitants were gone.