Crossword Genius

Mythological river around the underworld

Ross

I believe the answer is:

styx

(Other definitions for styx that I've seen before include "Charon's 26 carried dead souls across this river" , "River separating Earth from Hades" , "Infernal runner" , "River Charon rowed on" , "River crossed at death" .)

I've seen this clue in The New York Times.
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