The Vikings were seafaring peoples. Which region did they come from?

Erklärung

Viking fleets set out from the coasts and fjords of the northern kingdoms that became Denmark, Norway and Sweden, and their voyages spread outwards from there in every direction. Naming the British Isles trips up many readers, because those islands were among the first places raided and later settled, but they were the destination of the voyages rather than the homeland behind them.