This ancient monolith measures just over three metres in height, with a width of 1.13 metres and a thickness of 38 centimetres. Oriented along a north-south axis, the stone has stood sentinel over this landscape for millennia, though its original purpose remains shrouded in the mists of prehistory.

Standing stones like this one are amongst Ireland's most enigmatic monuments, dating primarily from the Bronze Age, though some may be earlier or later. They could have served various functions; as territorial markers, commemorative monuments, or perhaps as part of astronomical observations. The positioning of this particular stone, overlooking one of Donegal's most significant sea loughs, suggests it may have held special significance for the communities who erected it, possibly marking an important route or serving as a landmark for those navigating the waters below.

The stone was formally recorded during the Archaeological Survey of County Donegal, conducted in 1983 by Brian Lacey and his team of archaeologists. This comprehensive survey documented field antiquities across the county spanning from the Mesolithic period through to the 17th century, ensuring that monuments like the Muineagh standing stone are preserved in the historical record. Today, it continues to stand in its pastoral setting, a tangible link to Donegal's ancient past and a reminder of the prehistoric peoples who once shaped this landscape.