Related Clues:

• Where Achilles was dipped to make him invincible
• The French article produces Greek final solution to forgetting reality
• River of the underworld, in myth
• ''Inferno'' river
• Old dead flower from Greece found in Sticks reportedly
• Moon of 6-Down named for a mythological river
• Mother of Nike, in Greek myth
• Zeus swore oaths upon it
• Boundary river
• Charon's 26 carried dead souls across this river
• Greek underworld river
• River to 16-Across
• Classical river of forgetfulness
• River Charon rowed on
• Preacher only covered one classical route to underworld