That's uhh, not what the low countries looked like before, say, 1900
And the Main-Danube canal?
Explanation: The Rhine was used by the Roman Empire as a natural border to separate itself and the Germanic tribes. Barbarians, naturally, aren't people! Just filthy animals!
Just because they're filthy, people south of the Rhine aren't necessarily animals...
That's uhh, not what the low countries looked like before, say, 1900
And the Main-Danube canal?