Sápmi province south of Finland?

[eadingas]

As for Flemish connection - my best guess would be them Frisians getting around a lot.Their migrations are largely overlooked because for some reason they're not mentioned much in the sources, but they are known to be, for example, one of the four main germanic groups to have come to Britain, with Angles, Saxons and Jutes. Perhaps they have also influenced Flemish and Finnish backgrounds in the same way... although that is just a guess, and the connection may be much older.
From what I understand, genetically Finns are a very small and tight group, with not much diversity (that's what some Finns themselves told me) so that Flemish trait could come from pretty much anything and stay for a long time...

[Tellos Athenaios]

As for Flemish connection - my best guess would be them Frisians getting around a lot.Their migrations are largely overlooked because for some reason they're not mentioned much in the sources, but they are known to be, for example, one of the four main germanic groups to have come to Britain, with Angles, Saxons and Jutes. Perhaps they have also influenced Flemish and Finnish backgrounds in the same way... although that is just a guess, and the connection may be much older...

That is actually your worst guess. One of the reasons why languages spoken in Norway, Denmark, Sweden, The Netherlands and Brittain are so strikingly familar to a member of either ethnicity is the fact that all these area's have seen many Frisians passing by, or settling in the community. (Or just being the community.)

In any case: if you happen to speak Frisian, you'll be able to understand Danish, or Swedish without much trouble at all - even if it is your first encounter. The languages are that close.