Measuring 2.2 metres in height and tapering from a broad 2-metre base to a narrower 1-metre crown, this ancient monolith stands just 30 centimetres thick, oriented along a west-northwest to east-southeast axis. Now incorporated into a roadside wall alongside poor pasture land, the stone maintains its commanding presence despite its mundane surroundings.

Standing stones like this one are amongst Ireland's most enigmatic prehistoric monuments, with examples scattered across the countryside from the Bronze Age onwards. Whilst their exact purpose remains debated amongst archaeologists, theories range from territorial markers and astronomical alignments to memorial stones or ritual sites. The Carnafeagh stone's specific orientation might have held significance for those who erected it, possibly aligned with celestial events or marking important landscape features visible from this spot.

The stone's survival into the modern era, now serving as part of a field boundary, reflects a common Irish practice of incorporating ancient monuments into the working landscape rather than removing them. This practical approach has inadvertently preserved countless archaeological features that might otherwise have been lost. The Archaeological Survey of County Donegal, compiled in 1983, documented this and hundreds of other monuments across the county, creating a comprehensive record of Donegal's archaeological heritage from the Mesolithic period through to the 17th century.