sorry I lost track of the examples somewhere, but have you tried just putting fords on the affected (pink) rivers? Also could you find way with layers of showing the rivers in conjunction with regions and impassible terrain?
I managed to crash a RTW map just by having Nile river without ford when it completely divided an Egyptian region that spanned between sea and edge of map, implying that there was a definite path finding problem that could be caused in the earlier game engine by un-forded rivers making two parts of same region inaccessible from each other.
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