5 metres in length, 0.75 metres wide, and 0.4 metres thick. This sizeable block once stood upright as a standing stone, a type of prehistoric monument found throughout Ireland and dating anywhere from the Neolithic period through to the Iron Age. Though now toppled, perhaps by weather, agricultural activity, or the simple passage of millennia, it remains an intriguing reminder of the area's ancient past.

Standing stones, or galláin as they're known in Irish, served various purposes for prehistoric communities. Some marked burial sites or territorial boundaries, whilst others may have had astronomical significance, aligning with celestial events like solstices or equinoxes. Without excavation or further archaeological investigation, the specific function of the Kinnagoe stone remains uncertain, though its substantial dimensions suggest it held considerable importance for those who erected it thousands of years ago.

The stone was documented as part of the comprehensive Archaeological Survey of County Donegal, conducted in 1983 by Brian Lacey and his team of archaeologists. This survey catalogued field antiquities throughout the county, from Mesolithic sites dating back over 8,000 years to structures from the 17th century, creating an invaluable record of Donegal's archaeological heritage. The Kinnagoe standing stone, though no longer upright, continues to mark its spot in the landscape, a silent witness to the prehistoric communities who once inhabited this corner of northwest Ireland.