Measuring approximately 2.75 metres in length and one metre in width, this unassuming feature is actually marked as a 'Standing Stone' on the first edition Ordnance Survey 6-inch map, though its current horizontal position suggests it may have fallen or been deliberately toppled at some point in its long history.

The stone's documentation comes from the comprehensive Archaeological Survey of County Donegal, compiled in 1983 by Brian Lacey and his team of researchers. This extensive survey catalogued field antiquities throughout the county, spanning from the Mesolithic period right through to the 17th century, providing invaluable records of monuments that might otherwise be overlooked or forgotten. The Rann stone, whilst not as immediately impressive as some of Ireland's more famous standing stones, represents part of this broader archaeological landscape that dots the Donegal countryside.

Standing stones like this one, even when no longer standing, offer tantalising glimpses into prehistoric Ireland. They may have served various purposes; territorial markers, commemorative monuments, or elements of ritual landscapes; though their exact significance often remains mysterious. The fact that this particular stone was deemed important enough to mark on early Ordnance Survey maps suggests it held some local significance, perhaps preserved in local memory or tradition even after it had ceased to stand upright.