From the Baltic Sea to the Gulf of Finland, then along rivers and portages to the Black and Mediterranean seas. Also, the Vikings were in England and France, went to the Mediterranean through the Strait of Gibraltar. In the 9th century, the Vikings settled on the island of Iceland, in the 10th century they reached the shores of Greenland and the islands off the coast of North America.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.