It is bounded by Loch Riddan, and by the parishes of Kilfinan, Strachur, Dunoon, and Inverchaolain. It consists chiefly of a glen, flanked by high hills, and extending southward; and is about 12 miles (19 km) long. The River Ruel traverses the upper part of the glen, and falls into the head of Loch Riddan. The extent of coast is upwards of three miles (5 km) and the scenery is of the grandest description.