>>18447704Sure enough, the Bug was correctly labelled, and the line next to Warssaw/Warschau was indeed the Vistula.
But here I noticed the other borders—I had thought the northern border to simply be the coats of the Baltic Sea, but comparing the maps, it was too far south.
Then my eyes fell on the south-western border, and I immediately recognised it as Silesia's. In that case, the nothern border had to be East Prussia, and the eastern one...
Could it be...?