My current opinion on rivers: the function of rivers in this game is to give a battle malus to crossing armies that engage in battle. As such rivers should first and foremost be drawn strategically in places where we want to have that malus e.g. the Loire for the HYW or the Rhine for the Franco-Imperial Wars. At any rate they don't have to be exact.
Maybe other features could be added to rivers, for instance that of increasing the trade efficiency of adjacent nations inside the CoT the river is in.
e.g.
Here's an interesting campaign map which could show, among other things, the role of rivers in war: https://upload.wikimedia.org/wikipedia/commons/3/3a/Grunwald_1410.png
Maybe other features could be added to rivers, for instance that of increasing the trade efficiency of adjacent nations inside the CoT the river is in.
e.g.
The conflict was also motivated by trade considerations: the Knights controlled lower reaches of the three largest rivers (Neman, Vistula and Daugava) in Poland and Lithuania.[4]
https://en.wikipedia.org/wiki/Polish–Lithuanian–Teutonic_War
Here's an interesting campaign map which could show, among other things, the role of rivers in war: https://upload.wikimedia.org/wikipedia/commons/3/3a/Grunwald_1410.png
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