Somewhere in the Far East also has a river crossing death myth, I think,
@Barbara. They say it still affects death bed visions today.
Thank you, folks. That's very helpful. There are 5 rivers around the Underworld according the the Greco-Roman myth. The most famous, Styx (Hate), and Lethe (Oblivion), Acheron (Woe), Phlegethon (Fire), and Cocytus (Wailing)
My question was particularly linked to Charon The Ferryman, a demi-god, the son of Night and Shadow, Nyx and Erebus. The Roman version of accounts generally said Charon collected the dead from the banks of the Styx. The older Greek version of accounts generally said Charon collected the dead from the banks of the Acheron which is also a real river in Greece.
A classicist might argue it should be the Acheron, but I wanted to know your immediate thoughts, so as not to thrown any spanner into the works of a story.
Writer's dilemma......If in a novel I said it was the Acheron, a classicist might say that's more correct, but far more readers might think, eh? And be thrown. Not because they've wrong, but that's the version that holds more sway nowadays which you've pretty much confirmed.
And indeed as
@Barbara suggests...any river can be viewed as an allegory of life and death.