The rushes thrive because the ground is damp, and the ground is damp because the site sits in coarse pasture near the crest of a low, east-facing slope, exactly the kind of marginal land that was never worth draining or ploughing. That accident of agricultural economics has left the earthwork largely intact for well over a thousand years.

The monument is a rath, the term used for the class of roughly circular, embanked enclosures built predominantly during the early medieval period in Ireland, broadly between the fifth and twelfth centuries. They functioned as farmsteads, the bank and its accompanying external ditch, known as a fosse, defining a protected space for a family and their livestock rather than a military fortification in the modern sense. This particular example is subcircular in plan, measuring approximately 31.5 metres north to south and 30 metres east to west. The flat-topped bank of earth and stone survives to between 0.35 and one metre in external height, and retains a width of between 2.2 and 3.6 metres. The fosse outside it is about 2.4 metres wide and still reads clearly in the ground, though it has silted to a depth of only 0.2 to 0.25 metres. A gap of 4.6 metres on the east side is thought to mark the original entrance, and a short run of facing stones on the south-western arc of the outer bank hints that the whole structure was once reveted in stone, giving it a more finished, deliberate appearance than the earthen mound visible today. The site was already considered significant enough to be marked with hachuring on Ordnance Survey six-inch maps produced in both 1840 and 1916, a sign of its legibility in the landscape across two centuries of mapping. The interior slopes gently downward toward the east, following the natural lie of the hillside, and the view to the south remains open and unobstructed.