Sava-Danube alignment to the Serbian-Bulgarian border
<a href="//commons.wikimedia.org/wiki/User:Accipiter_Q._Gentilis" title="User:Accipiter Q. Gentilis">Accipiter Q. Gentilis</a>
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This file was derived from: <a href="//commons.wikimedia.org/wiki/File:Donau_Einzugsgebiet.png" title="File:Donau Einzugsgebiet.png">Donau Einzugsgebiet.png</a><br>