Before someone says "Oh, no - not another Vikings meet the Maya / Olmec thread" - I am going in a different direction.
A Viking raider takes his ship across Russia, from river portage to river portage he arrives at the Caspian Sea. From river portage to river portage across Iran / Iraq he arrives in the Indian Ocean. From the Indian Ocean, he arrives in Hindu-held lands. What would it be like?
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Now for a little fun == according to archaeologists there is a tiny ivory Buddha found in a viking horde in Europe.