This ancient standing stone measures 1.68 metres high and 1.7 metres wide at its base, with a thickness of 0.26 metres, oriented northeast to southwest. Its location on low, waterlogged ground makes it particularly notable; most prehistoric monuments tend to occupy higher, drier positions in the landscape, suggesting this stone held special significance for those who erected it.

When archaeologists revisited the site in 2003, they discovered the monument had suffered considerable damage, having been knocked over and now lying on its side with one large piece and two smaller fragments broken away. The survey revealed something the original Archaeological Survey of County Donegal had missed: a second, smaller triangular stone positioned immediately to the east. Standing 0.94 metres high with a base width of 0.95 metres and matching thickness of 0.26 metres, this companion stone likely served as a buttress, helping to support its larger neighbour through the millennia.

The site at Aghaveagh represents one of many prehistoric monuments scattered across Donegal's landscape, each offering tantalising glimpses into Ireland's distant past. While we may never know the exact purpose these stones served; whether marking boundaries, commemorating events, or fulfilling ritual functions; their presence continues to connect us to the people who shaped this landscape thousands of years ago. The damage to the main stone serves as a reminder of how vulnerable these ancient monuments remain, even after surviving for millennia in Ireland's often harsh Atlantic climate.