Some river is not right in Europe scenario

[amtyurin]

[Trilarion]

Looks like it. Although it could be even valid, if it would continue from (26,42) to (26, 41). Merging of rivers should be possible.

It would probably be easy to filter for this river (length one and at a certain tile transition (either (26,42) to (26,43) or the other way around) and remove it.