The site consists of a collapsed stone wall that once formed an almost complete circle, though the southern side now lies open. Time and weather have covered these old walls with grass, softening their appearance into the landscape. The interior space remains notably level, suggesting it was deliberately flattened during its construction, likely sometime between the early medieval period and the 17th century.

The fort's builders chose their location carefully, positioning it on naturally defensive terrain. To the north, marshy and rocky ground would have made approach difficult for any unwelcome visitors, whilst the higher ground to the south provided access to good grazing land for livestock. This strategic placement reflects the dual purpose of these structures; they served both as defended homesteads and as centres for agricultural activity.

Today, the site stands as one of many archaeological features documented in Donegal's comprehensive field survey. These ringforts, whether built of earth or stone, represent the most common type of settlement from Ireland's early historic period. Each one tells a story of families who lived, farmed, and defended their small patch of land in what was often a turbulent and uncertain time. The cashel at An Fhothair joins thousands of similar sites across Ireland, quiet reminders of a way of life that dominated the Irish countryside for over a millennium.