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The "river" is actually a briny mix of salt water and hydrogen sulfide. It's much more dense than regular salt water, so it sinks to the bottom and forms a distinct separation that acts and flows like a river.
Even weirder, the lakes under the waves have waves of their own. Check out this video of scientists discovering the waves for the first time if you want to see something cool and hear what it sounds like when scientists lose their s%#t.