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I'm so curious to know _why_ the Greeks went "yep, that river Acheron, that's one of the five rivers of the underworld".

Does it emerge from a cave? Drain into a cave?

Just look spooky at night?

Maybe there's a certain smell? Sulfurous, or rotting?

City sewer up river?

city upriver burries a guy.. cave. Graveyard caves into a underground river, river fills with corpses for a week?