Pont 16 : Gare Loch, Loch Long and the Holy
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In the south of this map is the Firth of Clyde from Dunoon in the west to Rhu, just west of Helensburgh, in the east. The western margin is formed by Glentersan (Glen Tarsan) west of Loch Heck (Loch Eck). In the north east corner is a small part of Loch Lomund (Loch Lomond), including Cast:[le] Terbart (Tarbet, Dunbartonshire). The most northwesterly point (top left) is Arkenglas (Ardkinglas) on Loch Fyne.