This slender monolith, oriented north to south with a slight eastward lean, has been incorporated into what remains of an old field boundary; a common fate for many ancient stones across Ireland where practical farmers often repurposed prehistoric monuments into their agricultural landscapes.

The standing stone at Fál Aonaosa represents one of County Donegal's numerous prehistoric monuments, though its exact purpose remains enigmatic. These stones, erected during the Bronze Age or possibly earlier, may have served as territorial markers, commemorative monuments, or held ritual significance for the communities who raised them. The stone's position overlooking the lough suggests its placement was deliberate, perhaps chosen for its commanding view of the surrounding landscape and water below.

Today, this modest monument stands as a tangible link to Donegal's distant past, documented in the comprehensive Archaeological Survey of County Donegal compiled by Brian Lacey and his team in 1983. While it may lack the grandeur of larger stone circles or passage tombs, this weathered pillar offers visitors a chance to connect with the prehistoric inhabitants who once shaped this corner of Ireland, leaving their mark in stone for millennia to come.