This ancient stronghold, now reduced to its rectangular foundations, once measured 10 metres in length and just over 9 metres in width. Though only the base walls remain at a modest height of just over a metre, you can still trace the impressive engineering of this medieval tower; the surviving inner wall face on the east southeast side reveals that the walls were nearly 2.5 metres thick, built to withstand both Atlantic storms and potential invaders.

The castle has been in its current ruined state for quite some time; historical records from the early 19th century describe it looking much as it does today, with its interior filled with rubble from centuries of collapse. If you look carefully at the northern side of the site, you might spot faint traces of additional foundation lines, suggesting this tower was once part of a larger complex. These ghostly outlines hint at adjoining buildings that have long since vanished into the landscape.

Now protected as National Monument 43 under Irish law, Eoghanacht Castle represents one of many such fortifications that once dotted the Aran Islands. These towers served as both defensive structures and symbols of power for the local chieftains who controlled this strategic position at the mouth of Galway Bay. The site was formally documented in Paul Gosling’s Archaeological Inventory of County Galway in 1993, ensuring its place in the official record of Ireland’s medieval heritage.