This is a rath, the Irish term for a ringfort, a type of enclosed farmstead built throughout Ireland during the early medieval period, roughly between the fifth and twelfth centuries. The bank here measures about 26 metres across its north-south axis, rises to 0.8 metres on the interior side and 1.4 metres on the exterior, and is broken by a single gap on the south-south-east, just under three metres wide. That gap is almost certainly the original entrance, oriented away from the prevailing wind, a common feature of these structures.

Ringforts were not defensive fortifications in any military sense, despite the name. They were farmsteads, the enclosed homesteads of early Irish farming families, and thousands of them survive across the country in varying states of preservation. The earthen bank would have enclosed a space used for dwelling and for protecting livestock overnight. At Rathreagh More, the interior surface is uneven and scattered with dumps of stone, suggesting the ground has been disturbed at some point, though no specific excavation record is noted in the survey compiled by Denis Power. What the 1923 Ordnance Survey six-inch map does reveal is that field boundaries once ran immediately to the west of the site and abutted the eastern bank; those boundaries have since been removed, altering the landscape around the fort even as the fort itself has remained.

The site sits on undulating pasture on a south-south-west facing slope, which makes it relatively easy to spot from the right angle, though the dense overgrowth covering the bank and a thick growth of nettles on the interior make any close inspection uncomfortable outside of late summer or early spring. An aerial photograph taken in March 2006 as part of the Archaeological Survey of Ireland gives a clearer sense of the full circuit of the bank than any ground-level approach is likely to provide. Anyone seeking the site should be prepared for working farmland, meaning access would require landowner permission, and the obscuring vegetation means patience and good footwear matter more here than at more formally managed monuments.