What did the Vikings believe surrounded the continents?

Explanation:

The Vikings were a seafaring people from the late eighth to early 11th century who established a name for themselves as traders, explorers and warriors. They discovered the Americas long before Columbus and could be found as far east as the distant reaches of Russia.

While these people are often attributed as savages raiding the more civilized nations for treasure and women, the motives and culture of the Viking people are much more diverse. These raiders also facilitated many changes throughout the lands from economics to warfare.