Your work is appreciated: in the previous pages you can find a layout for Finland, but I'm sure it can be improved.
First of all you have to make a design decision: which names to use - the OTL historical Swedish ones, as the region became the eastern part of the Swedish realm, or the pre-Christian Finnic settlement names? Since you cannot change province names mid-game (or can you?), this is a significant decision. In case you want to portray the region of modern Finland and eastern Karelia realistically, you'd want to split even these regional entities up to single-province chiefdoms centered around hill forts - in OTL the local population didin't have wider authority, only shifting alliances that can be portrayed with in-game marriages and mechanics anyway. Just like the fate of Stigtuna shows, the peoples of modern-day Finland and Baltic states were living in societies quite similar to Viking Age Scandinavia by the time Sweden and Denmark already had a rudimentary higher authority in the form of kings and other symbols of mediecal central European Christian culture. While the people of Eastern Baltic could occasionally could muster significant gatherings of military power, there weren't any "kings of Finland" to speak of. Modern-day Baltic states were a different case, but what in the area where Finnic people lived in the beginning of first millenium AD, the term "kuningas" existed as a direct loan from Germanic languages and was only used about local chieftains, as Swedish-era papal letters condemning figures like "
Cuningas de Rapalum" show.
https://lh6.googleusercontent.com/-L8izSzEsPbY/T1tKGzVXdtI/AAAAAAAAADo/mBX4O492s-s/s800/finns.jpg
So, if you want to portray the area of Finland during Baltic Crusades and late Iron Age realistically, you also need fitting names instead of names of later settlements and Swedish names in the coast - while there has been Nordic presence in Ostrobothia and coastal areas and in western shores of Laatokka since the Viking era, naming a medieval province after a settlement established officially in 1606 is an anachronism in an otherwise excellent map mod. Here is the northern extent of larger settlements in the beginning of the game.
http://www.nba.fi/fi/Image/4842/zz-kartta-rautakausi-3.gif
Here are suggestionf for more fitting province names and setup:
Current name --> change proposal
Rovaniemi = too north for succesfull agriculture, historicaly inhabitated by small families of hunter-gathering and reindeer-herding Sámi people who were randomly taxated by all of their southern neighbours. I'd merge this to southern areas.
Kuusamo = see above, no Finnic population and thus no agriculture or activity justifying existence as a CK II province until 1500 or so.
Kvenland = see above, this is the northern extend of the influence of more agrarian cultures of southern Fennoscandia.
Kem = Uhtua - Part of the White Sea coast and lucrative trade routes where furs and walrus tusks were shipped down the great rivers of Rus and exchanged for silver. Culturally Finnic, religiously Finnic Paganism.
Revolax = Oulu or Kaakkuri, named after the oldest known settlement in the area. Culturally Finnic, religiously Old Norse or Finnic Paganism.
Vasa = Vöyri. The region was initially widely settled, but then abandoned during the Viking Age as too vulnerable to seaborne raids - as a former seabed the coast was too flat for good hillforts and clay earth could not be tilled with initial primitive farming equipment until High Middle Ages. Culturally Finnic, religiosly Old Norse or Finnic Paganism.
Birkaland = Vanajavesi. This was the most settled area of modern-day Finland, and the heart of the historical region of Häme (Tavastland in Swedish). A string of hillforts in hills, a lot of settlement among the shores of the major lakes. Culturally Finnic, religiously Finnic Paganism.
Satakunta = I'd keep the name as it is. Part of the trade network linking to Baltic, grave findings show a lot of links to Central Europe and North Sea Coast. Culturally Finnic, religiously Finnic Paganism.
Turku = another name I'd keep as it is, although the town itself wasn't established until around year 1200. The oldest continuously inhabitated region in modern-day Finland. Culturally Finnic, religiously the population had already widely adopted Christian burial rites by the time of the Danish and Swedish crowns begun to expand their influence to the area. Thus the province religion should be either Catholic or some Christian heresy representing their synchetistic worldview.
Nyland = Third name I'd keep as it is. In both Finnish and Swedish the area is called "New land" as it was historically abandoned by Finnic-speaking population as too vulnerable to raiders from the sea during Viking Ages. Mostly uninhabitaded at the time the first game scenario begins, in later scenarios culturally mixed (Swedish-speaking coasts and Finnic population inland) and Catholic.
Lahti = Hollola. Part of the Häme Region centered around lake Päijänne. Culturally Finnic, religiously Finnic Paganism.
Jyväskylä = Päijät-Häme - Part of the Häme Region centered around lake Päijänne. Culturally Finnic, religiously Finnic Paganism.
Vyborg = I´d split this province in two, leave western half as Viipuri and name the eastern half at the shore of Laatokka Korela along this border:
http://www.kolumbus.fi/jukka.karvonen/htm/Images/Pahkinasaari.jpg
The population was focused on shores of Laatokka anyhow:
http://www.kolumbus.fi/rastas/img/kalm_8-11.png
Name of a Swedish fortification established on a same island where local Finnic ("Karelian") population had their own wooden fort and trade depot. Culturally Finnic, starting scenario religion either Orthodox or some Orthodox heresy (to represent similar syncretism than in Western Finland)
Mikkeli = Mikkeli. Ethnically Finnic, starting religion either Finnic Paganism or previously mentioned Orthodox heresy.
Kontiolax = Savilahti. As above.
Savonia = I'd merge this province to it's neighbours - too north to have fixed agricultural presence - only hunther-gatherers and forest.
Kondopoga = I'll have to come up with a better name for this settlement as well, but at the moment I don't have the right books available.
Olonets = Kurkijoki, move the "Kontiolax" province border nothwards and merge the border of this province to the proposed province of Korela - this were the twin centers of Laatokka region, that had a lot of influence from Scandinavia due their location next to the Varangian Way and on the shores of the same lake as the old trade hub of Aldeigjuborg.
https://lh4.googleusercontent.com/-S85A-5gSJJc/T1tKIho6TcI/AAAAAAAAAEE/XGy-3tPhxRw/s800/livs.jpg