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Another river, Noteć/Netze, was an ethnic border (Polish-speaking to the south and east, German-speaking to the north and west) in early 1900s:
Fragment from Jakob Spett's map (green = Polish-speaking majority):
I highlighted the course of the Noteć/Netze river with thick blue line:
^^^
It also became the political border between Poland-Germany after 1918 (Wieleń, Czarnków, Walkowice from the map above became border towns):
Red line = pre-1939 Polish border (here it was along the Noteć River):
Although if you go back to 1772 (before the Partitions), large areas to the north and to the west of the Netze were also parts of Poland at that time.
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