Rafiki wrote:Feedback is always welcome

However, perhaps you can elaborate on why you think it is a flaw? Did the river (potentially) influence military operations in this era? Or is it purely aesthetic?
Purely aesthetic? No.. I don't think so. The Inn-river, the Tirol capital Innsbruck (Bridge over the Inn) is named to that river. At the Austrian-German border near Kufstein is the fast streaming and alsmost 100 meters wide Inn-river a real barrier for any army to cross without a bridge.
The Inn river near Kufstein
The Inn-river in Bavaria is clearly wider as the Isar-river and the latter is presented on the game map. Finally the Inn has a greater average flow than the Danube when they converge in Passau.
The Inn river just before merging with the Danube at Passau
--
I have a suggestion for a redrawn map, see picture below.
Three rivers are added at the map of South-East Bavaria. I have also made some minor Austrian-Bavarian border corrections too.
(1) The Inn-river is added on the map. After passing the Austrian-Bavarian border, just south of the map edge, it flows just east of Rosenheim to Wasserburg. North of Wasserberg the Inn is turning to the east. After it has past Marktl am Inn (the birthplace of the current pope Benedictus XVI) a border river from the south (the Salzach) flows in the Inn. From there the broader Inn-river is following the Austian-Bavarian border, passing Braunau am Inn (the birthplace of Adof Hitler) until it flows into the Danube at Passau.
(2) The Salzach river is added on the map. It is steaming along Salzburg where a few months before the begin of the Seven Years War the composer Mozart was born. North of Salzburg is the Salzach the border river between Bavaria and Austria until it flows in the Inn river between Marktl and Braunau.
A picture of the Salzach at Laufen. At the left and top is Austria, the German town Laufen is situated inside the river meander.
(3) I have added the short Ilz river on the map too. It is streaming from the Austrian (the current Czech) border to Passau. This 65 km short river have a remarkable difference in height of almost 780 meters.
A picture of the Ilz river.
The city Passau is known as the Dreiflüssestadt (City of Three Rivers), because the Danube is joined there by the Inn from the South, and the Ilz coming out of the Bavarian Forest to the North. I suggest a small border correction on the map with Austria. In the real world it is east of Passau were the Danube (having Germany on its
north bank) is for almost 20 km a border river too.