To my understanding, a river’s source is fueled by snow and rain, but is it enough to keep it running for that long? Afterall the source doesn’t get rain/snow 24/7 so wouldn’t bigger rivers drain the source in a matter of weeks instead of many hundreds of years?
In: Planetary Science
The [French Broad River](https://en.wikipedia.org/wiki/French_Broad_River?wprov=sfti1#History) flows east to west *across* the Appalachian Mountains, because it is *older* than the Appalachian Mountains.
It is a river that is older than North America. Older than land-based life more complex than microorganisms. Older than *plants*. It has almost no fossils in it because *it is older than fossils*.
Rivers can be really, really, really old.
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