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Explanation: Geography books here in UK usually anglicize them to urstromtal(s)(!), sometimes using italics. They are as much a part of the English language as roches moutonnées, firn, föhn, schadenfreude, weltanschauung or realpolitik, and occur in the North German Plain and in Poland, where the rivers Weser, Elbe and Vistula now occupy their prehistoric beds.
Explanation: According to me the sentence would read as follows:
The city (Berlin) lies in the depression (low lying areas) of the glacial valley of Berlin, flowing through the river-lake system (lowland river) of Spree.
Explanation: While streamway does not sound the most appropriate, it does occur regularly and should be mentioned here as an alternative, as it is not one a person could guess. I prefer valley, which is generally more common that streamway in searches.