what river starts in swiss alps then end in germany

The Danube River does not start in the Swiss Alps. However, I can think of a few rivers that start in the Swiss Alps and end in other countries, including Germany.

One such river is the Rhine River’s tributary, but a more specific answer would be the ‘Iller’ or the ‘Wiese’; however, neither of those are as well known as the Rhine itself, which does indeed start in the Swiss Alps.

So, the most likely answer is the Rhine River’s tributaries or the Rhine itself, which starts in the Swiss Alps and flows through several countries, including Germany, before emptying into the North Sea.