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.
Maybe some sort of geyser/volcanic pressure hits these subterranean reservoirs and forces it upwards into a bubbling creek?
Oh hell yeah