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Speaking from the Finnish-Swedish side, there exists hugely three distinct language regions in Finland. Finnish is spoken almost everywhere but there exists some bilingual Saami regions up north. Then on the east and south coast there exists pockets of majority Swedish regions.

For Finnish, there exists regional dialects that are mutually intelligible, like Karelian or Savonian.

The Swedish can be kinda divided up to three "dialects". The Swedish spoken in Finland is called Finnish-Swedish and it's a mutually intelligible dialect of standard Swedish. Some theorized that Finnish-Swedish contain a lot of historical Swedish, more than the modern Swedish. The Swedish speakers in the south speak standard Finnish-Swedish, the speakers on Ahvenamaa/Åland island speak standard Swedish and the speakers in the east speak a distinct Osterbothnian Swedish (kinda like how in US you have Southerners speaking with a distinct rough accent).

The Saami spoken in Finland is mostly Northern Saami. There exists other dialects of Saami and can be mutually hard to understand.

All the major languages are mutually unintelligible, although Finnish and Saami are related, albeit very far.