The simple altar consists of a flat stone slab measuring 85 centimetres long and 55 centimetres wide, carefully positioned atop a dry stone wall that still stands three courses high at about 60 centimetres. According to local resident Sean O’Beirne, the site has been known as a mass rock for generations, passed down through oral tradition in the community.

The location was carefully chosen for both practical and spiritual reasons. The natural rock face provided concealment and protection from the elements, whilst the southern exposure offered sweeping views across Teelin Bay to the southwest, allowing lookouts to spot approaching authorities during clandestine services. These outdoor altars served remote Catholic communities throughout the 17th and 18th centuries, when priests risked imprisonment or death to celebrate Mass in secret.

Today, the mass rock stands as a quiet monument to religious persecution and resilience in County Donegal. Though weathered by centuries of Atlantic storms, the altar remains intact, its dry stone construction a testament to the skill of those who built it under threat of discovery. The site was documented by archaeologist Caimin O’Brien in May 2010, ensuring this piece of hidden heritage is preserved in the historical record.