Could there be a plausible way to have a freshwater river that sources water from a saltwater ocean? By plausible I mean by means of everyday, scientifically-sound, boring-ass reasons, so no magic.
I am not a scientist, and do not know anything about rivers. Please help.
If your river source is at sea level, where does it go from there? A system of caves that provide filtration to desalinate the water and then it...just goes deeper. Yeah idk I don't think this one works
Maybe some sort of geyser/volcanic pressure hits these subterranean reservoirs and forces it upwards into a bubbling creek?
Oh hell yeah