Ringforts, sometimes called raths, were the typical enclosed farmsteads of early medieval Ireland, built from roughly the fifth to the twelfth century and used to protect a household and its livestock. Most rely on a simple earthen bank, but this one at Cronesallagh has its exterior face reinforced with drystone construction, giving it a more deliberate, almost formal edge that distinguishes it from the average earthwork.

The enclosure is oval, measuring roughly forty metres north to south and thirty-five metres east to west, with a bank of earth and stone three to four metres wide. On the interior, the bank rises to about a metre at its highest point along the eastern arc; on the outside, the drystone facing pushes that effective height to between one and one point two metres. There is no trace of an external fosse, the ditch that typically rings a more elaborate fort, and no visible internal features survive above ground. The entrance, a simple two-metre gap in the northeast, is modest, almost understated. What disrupts the picture is the western side, where the upper portion of the bank has been deliberately shoved inward at some point to accommodate a new field boundary, leaving behind a collapsed scatter of stones, earth, and tree stumps. That act of agricultural pragmatism, probably centuries old itself, now sits frozen in place while the rest of the circuit quietly holds its shape. The fort was already recorded on the Ordnance Survey six-inch map of 1838, meaning it had survived long enough to be considered a landmark even then.