Marked on the first and second editions of the Ordnance Survey 6-inch maps simply as ‘Fort’, this single-ringed earthwork has largely succumbed to time and the elements. Today, only traces of what appears to be the southern section of its defensive fosse, or ditch, remain visible in the grazing land where cattle now roam.

This unclassified ringfort at Gaddyduff represents one of thousands of such structures that once dotted the Irish landscape. These circular fortified settlements, typically dating from the early medieval period, served as defended homesteads for farming families. The original structure would have consisted of an earthen or stone bank enclosing a raised area, surrounded by one or more ditches; a practical design that provided both security and status for its inhabitants.

The site’s documentation comes from the comprehensive Archaeological Survey of County Donegal, compiled in 1983 by Brian Lacey and his team of researchers. Their work catalogued field antiquities spanning from the Mesolithic period through to the 17th century, preserving knowledge of sites like this one that might otherwise fade from memory. Though little remains of the Gaddyduff ringfort today, its presence on historical maps and in archaeological records ensures its place in the broader narrative of Donegal’s ancient settlements.