That inaccessibility is itself part of what makes it interesting. The enclosure has not been cleared, landscaped, or signposted into respectability. It simply persists, tangled and largely ignored, in the middle of working farmland.

This is a rath, the Irish term for a ringfort, the most common archaeological monument type in Ireland. Ringforts were typically enclosed farmsteads, built and occupied roughly between the fifth and twelfth centuries, defined by one or more circular earthen banks and ditches. The Coolrus example, compiled in the records by Denis Power and uploaded in August 2011, measures approximately forty metres in diameter. Its defining feature is a scarped edge, meaning the inner ground has been cut back to form a steep face, here standing around 0.85 metres high and 1.55 metres wide. Beyond that scarp lies an external fosse, or ditch, measuring roughly 0.2 metres deep and 1.35 metres across. These are modest but legible dimensions, sufficient to have marked out a boundary and offered a degree of enclosure to whoever lived within. A later field boundary, running from south to west, has been laid directly over part of the scarp, the kind of quiet overwriting of one era by another that happens across the Irish countryside without ceremony.

Accessing the site requires crossing private farmland, so any visit would depend on the goodwill of the landowner. The southeast-facing slope means the earthwork catches morning light reasonably well, which can help in reading the contours of the ground from a distance. What a careful observer can actually see from the perimeter is the scarped edge itself and the line of the fosse, along with the dense mass of vegetation that now fills and guards the interior. That vegetation, while frustrating from an archaeological standpoint, is also a kind of accidental preservation. The ground beneath the briars has not been ploughed or built upon. The enclosure is there, more or less as it was left, waiting without any particular urgency to be noticed.