That entrance survives. A slight ramp leading outward from a four-metre break in the bank still marks exactly where people once crossed in and out of their daily lives, and the fact that it remains readable at all is quietly remarkable.

A ringfort, sometimes called a rath when built primarily from earth rather than stone, was the standard farmstead type of early medieval Ireland, in use roughly from the fifth to the twelfth century. This example at Formoyle sits on a gently south-facing slope in undulating pasture, a position typical of the type: sheltered from the north, oriented to catch light and warmth, and placed where the eye could range across the surrounding land. The circular interior measures about 22.5 metres in diameter, enclosed by a bank nearly eight metres wide, though its internal height has weathered down to around 0.4 metres above the ground surface. There is no visible fosse, the external ditch that often accompanies such banks, which either never existed here or has silted and levelled over the centuries. The bank is best preserved along its north-east to south-south-east arc, suggesting that the southern and western sections have suffered more from agricultural activity or simple erosion over time.