Skagerrack
The Skagerrak is an arm of the North Sea between southern Norway, northern Jutland and the Swedish coast. Its waters deepen sharply toward the Norwegian Trench, while the Danish side is shallower. Ships crossing it joined the Baltic approaches to the North Sea, and smaller vessels carried local trade between Jutland and Norway. In the seventeenth century people from Vigsø and Klitmøller used their own boats for these crossings, despite disputes with customs officials.