Here is a simple topographic map of North Central Europe:
Say you wanted to invade the Roman Empire and you were coming down from the Danish Jutland Peninsula. How would you do it if you did not care for crossing mountains, hills and other hard to pass natural barriers? Here is one way. The red lines are the “lazy man’s invasion routes” and the blue line is an approximate Roman border (obviously it changed over time).
Now compare this to the Ketrzynski map of Slav settlement (again, only in Germany and only West of the Elbe-Saale, i.e., Uaba/Souava line):
More on the Hammer of Thor here.
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