This gentle elevation, measuring between 20 and 30 metres, marks the probable location of a ringfort that appears on the first edition Ordnance Survey maps simply as 'Fort'. The site at An Ghallbhuaile, also known as Tc An Clochán, represents one of countless defensive homesteads that once dotted the Irish countryside.

The fort's builders chose their location carefully, positioning it on the valley slope where they would have needed to build up the southern side to create a level platform. Based on the pattern of field walls in the area and the local geology, archaeologists believe this was likely a stone enclosure rather than an earthen one; a practical choice given the readily available building material in this part of Donegal. These stone ringforts, or cashels as they're sometimes called, served as fortified farmsteads for prosperous families during the early medieval period, typically between the 5th and 12th centuries.

Today, visitors to the site need a keen eye to spot the fort's remains amongst the pastoral landscape. The Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983, catalogued this and hundreds of other monuments across the county, preserving knowledge of sites that might otherwise fade from memory. While this particular ringfort remains unclassified in terms of its specific type or date, it stands as a quiet testament to the generations who once farmed these valley slopes, their stone walls now barely distinguishable from the field boundaries built centuries later.