The Cowal peninsula is bounded by Loch Fyne on the west and Loch Long and the Firth of Clyde on the east. It is separated from the Isle of Bute by the deep narrow straits of the Kyles of Bute. The coastline is incised by deep sea lochs, principally Loch Riddon, and Loch Striven. These split the southern half of Cowal into three narrower peninsulas; on the west, the Kilfinan peninsula, and on the east, the Toward peninsula, which is also isolated from the north of Cowal, by the Holy Loch. The small central peninsula is divided from the Kilfinan peninsula by Loch Riddon, and the interjection of Bute, and its Kyles.