Central European river that rises in the Czech Republic and flows into the Gulf of Pomerania of the Baltic Sea (4)

I believe the answer is:

oder

(Other definitions for oder that I've seen before include "German and Polish river" , "waterway" , "River flowing into the Baltic" , "River that, with the Neisse, forms the German-Polish border" , "River forming northern part of the German-Polish border" .)

I've seen this clue in The Independent.

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