This very interesting image shows the difference in elevation between the Main and Danube rivers between Aschaffenburg and Passau. The Main-Danube locks step the river boats from one elevation to the other.
[Continental Divide - Main-Danube Canal Locks]

ទំហំ

500*326

ស្លាក

danube canal, main danube canal, main danube canal locks, Main River, the danube river