Fascinating. Is there such a thing in Europe? I am not aware...
The river connecting two oceans: A creek in Wyoming splits in two, one side flowing to the Atlantic and one side to the Pacific. You can’t pass the...
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Alright, here is the Wikipedia article on this bifurcation creek/river: https://en.wikipedia.org/wiki/Parting_of_the_Waters
As for continental Europe, two things come as relevant:
* Nerodimka river draining into Black and Aegean seas: https://en.wikipedia.org/wiki/Nerodimka_(river); and perhaps
* Danube sinkhole: https://en.wikipedia.org/wiki/Danube_Sinkhole connecting Black Sea and North Sea drainage systems
Further interesting reading: https://en.wikipedia.org/wiki/List_of_unusual_drainage_systems
@hanswolters
Today was not in vain: I learned something interesting :-).