This is a cashel, a type of ringfort defined by a stone or stone-faced bank rather than a purely earthen one, and the term points to something worth pausing over. Ringforts, which date broadly from the early medieval period in Ireland, were the enclosed farmsteads of their time, domestic and agricultural rather than military in any conventional sense. The cashel at Rathshanmore measures 36.7 metres in diameter across its circular footprint, a modest but coherent space that would once have contained a household and its immediate working life.

The enclosing bank is built from earth and stone with a stone facing, reaching a maximum external height of 1.2 metres on the south-east side, where the slope drops away, and a somewhat lower internal height of 0.8 metres on the north side. The bank is up to 1.8 metres wide. The entrance, a stone-faced gap two metres across, is positioned at the north-west, an orientation not uncommon in early medieval enclosures. A 1973 description by Reynolds recorded the site as having two banks, suggesting either that a second, outer bank once existed or was more visible at that time, though the more recent account notes only the single defining bank. The discrepancy is a small puzzle that the site itself does not resolve, and it serves as a reminder that these places are not static; they change with seasons, land use, and the slow work of time.