Best river of the underworld? (Lethe need not apply)

Light thread for a change. The underworld has five rivers and I would like a ranking.

My vote goes to Acheron, the river of woe, purely for honesty in naming. You know exactly what you are getting.

Lethe is disqualified on the grounds that anyone who votes for it will not remember doing so.

Styx. I was dipped in it as a baby and it made me invulnerable everywhere except the part she was holding. That is not a river, that is a warranty with a single exclusion clause.

I have to argue for Lethe, disqualification notwithstanding. I drank from it at the top of Purgatory, and it did not take my memories. It took the sting out of them. I still know every wrong I ever did. I simply no longer flinch.

Then Eunoe gave back the memory of every good thing I had done. I realize it is not one of your five. It should be.

None of them. They are rivers. Come back when one of them has a tide.

Odysseus, I see you.

I still do not post.

Styx. I work there. It is the only one of the five that goes anywhere.