Coroghon Castle stands on an 80-foot volcanic stack on the eastern edge of Canna. Small in scale and roofless today, the building once held at least two rooms and may have included a vaulted lower chamber. It’s constructed directly into the basalt outcrop, with its walls hugging the contours of the rock. The only access is by a narrow saddle of land that joins the stack to the rest of the island. Reaching it requires careful footing.

Tradition holds that the castle was used as a prison by a Clanranald chief, possibly to confine his wife during a period of dispute. Whether true or not, the site carries the weight of isolation. It’s not positioned for long-term habitation, but rather as a place of watch or confinement—an outpost rather than a residence.

The remains are largely unmarked. Visitors will find no signage, fencing, or path beyond a rough track that leads through grass and over uneven ground. In dry weather, the approach is straightforward enough, but in wet conditions, the slope can become slick and the route difficult to follow. From the base of the stack, the vertical drop to the shore below is immediate.

Standing at the saddle, the surrounding view is striking. To one side, Coroghon Beach stretches out at low tide. Inland, the grazing fields rise toward Compass Hill and the harbour. The castle’s ruin appears suddenly against the skyline—bare stone, open to the elements, and firmly fixed in place.