Tucked between two ridges of land that rise to the northwest and southeast, this prehistoric monument sits in what remains a rather boggy and isolated spot. The stone’s absence from the first edition of the OS 6-inch map is peculiar, given the thoroughness of those Victorian surveyors who tramped across Ireland documenting every rath, cairn and ecclesiastical ruin they could find.

The standing stone represents just one of thousands of such monuments scattered across the Irish landscape, each one a silent testament to the beliefs and practices of our Bronze Age ancestors. These solitary sentinels, erected sometime between 2500 and 500 BCE, likely served multiple purposes; marking territorial boundaries, commemorating the dead, or perhaps aligned with celestial events that held significance for the communities who raised them. The Castleblaigh example, set in its marshy hollow, may have marked a route through what was once even wetter terrain, guiding ancient travellers between the protective ridges.

Today, the stone stands as it has for millennia, weathered but enduring, its original purpose lost to time. Its documentation in the Archaeological Survey of County Donegal ensures that this modest but significant piece of prehistory won’t be forgotten again, even if those meticulous Victorian cartographers somehow missed it the first time around. For those willing to navigate the squelchy ground to reach it, the stone offers a tangible connection to Donegal’s distant past; a reminder that this seemingly empty landscape has been inhabited, traversed and marked by human presence for thousands of years.