Given that goods typically moved by water (far less energy than overland), possibilities of longer voyages are somewhat more credible.

I don't know the actual history / archaeology, or quantities involved.

Europe does have a remarkably good inland navigable river network.

There's mention here that Scandinavians raided Mediterranian coastal towns and villages:

https://www.realmofhistory.com/2016/05/17/cypriot-copper-axe...

This map suggests a possible eastern route (the accompanying web page makes no mention of Sweden, scandinavia, or the Baltics):

http://theancientneareast.com/wp-content/uploads/2014/08/Tra...

(from: http://theancientneareast.com/the-bronze-age-world-system/)

Travel along the Donau, Dneiper, or Don rivers could have reached the Black Sea:

https://www.worldatlas.com/webimage/countrys/euriv.gif

This article and map suggest sea routes, through the Straits of Gibraltar:

https://www.speroforum.com/a/ROURBRXIJL49/77965-Ancient-trad...