Promontory fort - coastal, Glebe, Desertegny, Co. Donegal
On the eastern shore of Lough Swilly in County Donegal, a mysterious enclosure sits isolated from the mainland, cut off by a natural chasm that has rendered it completely inaccessible.
Promontory fort - coastal, Glebe, Desertegny, Co. Donegal
This intriguing site appears on the 3rd edition Ordnance Survey 6-inch map, where cartographers carefully marked its position near what appears to be a small promontory fort (catalogued as DG081-010-). The relationship between these two archaeological features remains unclear, though their proximity suggests they may have shared some historical connection or strategic purpose along this dramatic stretch of coastline.
The enclosure’s current state of isolation raises fascinating questions about its original function and the landscape changes that have occurred since its creation. Whether the chasm formed naturally through coastal erosion or existed when the site was first established, it now serves as an inadvertent preservation mechanism, protecting whatever archaeological remains lie within from modern interference. The site’s position overlooking Lough Swilly would have provided excellent views across the sea inlet, making it an ideal location for defensive purposes, maritime surveillance, or perhaps ceremonial activities connected to the water.
This tantalising glimpse into Donegal’s past comes from the comprehensive Archaeological Survey of County Donegal, compiled by Brian Lacey and his team in 1983. Their meticulous work documented field antiquities spanning from the Mesolithic period through to the 17th century, creating an invaluable record of the county’s rich archaeological heritage. Sites like this isolated enclosure remind us how much of Ireland’s ancient landscape remains enigmatic, with natural forces and time conspiring to both preserve and obscure the stories of those who came before.





