How is the Danube river connected to other rivers?

The Danube river is connected to other rivers through a network of canals and tributaries. The Danube-Oder Canal connects the Danube to the Oder river in Poland, and the Danube-Main Canal connects the Danube to the Main river in Germany. The Danube also has a number of tributaries, including the Inn river, the Drava river, and the Sava river. These tributaries contribute to the Danube's flow and help to sustain its ecosystem.