This remarkably beautiful ruined castle, encircled by the remains of a massive crenellated defence outer wall, was anciently a stronghold of the MacDonalds of Clanranald, dating back at least to the 13th century. Surrounded by the tidal salt waters of Loch Moidart, a little to the north of the Ardnamurchan peninsular, it stands on an isolated rock attached to the mainland by a causeway, by which it is accessible at low tide from a small promontory near Dorlin House.

In August 1745 the castle was used to hide the arms and canon which had been brought in the Du Teillay from France with the Prince, consisting of guns, pistols, swords and 24 small canon with powder and ball. Twelve of the canon were abandoned, along with some other heavy baggage, because there were not enough horses available to carry them.

Loch Moidart is still a wild, remote and unspoiled beauty spot which is worth the effort to visit. It is best reached by crossing the Corran Ferry and going along the north shore of Loch Sunart via Strontian to the Inn at Salen; then strike north through Acharachle and up to Dorlin, from whence it is a short walk to the causeway.