The source of the Rhein is a small lake. Even the Rhein has several small sources, can they supply such a big river only by rain and spring water? How big are those reservoirs?
In: Earth Science
You may want to play with [River Runner](https://river-runner.samlearner.com/), which is an app where you can trace the path of a raindrop downstream from any place in the continental U.S, including a satellite-view animation of its journey. Won’t help you answer for the Rhine, but it can be fun to click anywhere in the mid-US and watch it eventually end up in the Mississippi and Gulf of Mexico.
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