I see you have added something in Naumdal (Noregr) I'm not sure if it is lake/river/fjord? If you "wanted" to add more lakes in Noregr it should be Snåsavatnet (Innritrøndelog) or Randsfjorden (Ringeriki)
I like to add that Innritrøndelog is missing a part (Skeynafylki) wich is now currently a part of Ytritrøndelog, I'd like to see it corrected. This map could help to correct it (under Frostuting)
I have also suggestion for some mountain passages in Scandinavia, the reason for the suggestion is that some areas did have mountain pass and others did not. And some of the mountain passes seem unrealistic to have a large army cross it would not make it impassable for smaller.
Gudbransdalr-Sygnafylki,
Ringeriki-Sygnafilki and Hordaland
Suggestion for counties that should not have access to eachother because there existed no mountain passage between them.
Ringeriki-Telemork
Ytritrøndelog-Jemtland
Naumdalr-Jemtland
Svearike +Jemtland
In Sveariki there existed wast forest and wasteland in the north that created barriers between eachother.
Vermaland-Narke and Jarnberland
Jarnberland- Alir and Vermaland
Alir-Herjadalr
Helsingsland-Jemtland
Gautland
There existed also large forest here that made barriers, but later roads were made in 1100 so it would not be represnted well in the game. But southern Småland should have a forest wasteland between the duchie of Austergautland (Vårend and Finneved) and Skåne Halland wich created the natural border between the countries
Denmark
Between Utland and Holstein theres are large areas with swamps wich creates a barrier to eachother.