Crossword Genius

Infernal river (4)

Ross

I believe the answer is:

styx

'infernal river' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for styx that I've seen before include "Infernal runner" , "River separating Earth from Hades" , "classical stream" , "River surrounding Hades" , "'River of Hate' in Hades" .)

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