| 2026-06-10 | "Dread river of oath," per Homer |
| 2026-01-01 | Charon's domain |
| 2025-07-07 | River of Hades |
| 2024-11-06 | River in which Achilles was dipped |
| 2024-09-02 | River to Hades |
| 2024-06-05 | River where Achilles took a dip |
| 2024-02-16 | Eldest daughter of Oceanus and mother of Nike |
| 2023-06-07 | Underworld boundary |
| 2022-11-21 | Mythical river of the underworld |
| 2022-10-05 | River of Hades |
| 2022-09-21 | River with a mythical ferryman |
| 2022-08-31 | "Mr. Roboto" band, 1983 |
| 2022-08-25 | Infernal river |
| 2022-07-07 | River on which Greek deities swore their oaths |
| 2022-03-24 | "Mr. Roboto" band |
| 2021-11-08 | Mythological river around the underworld |
| 2021-02-04 | River that comprises the fifth circle of Dante's Inferno |
| 2020-10-15 | Where Achilles took a dip? |
| 2020-08-08 | Daughter of Tethys in Greek mythology |
| 2020-06-28 | Charon's domain |
| 2020-03-15 | Charon's river |
| 2019-12-11 | Locale of Charon's ferry |
| 2019-11-06 | River of Hades |
| 2019-05-06 | River of the underworld |
| 2019-04-25 | Home to a mythical ferry |
| 2019-01-10 | River whose name comes entirely from the last eight letters of the alphabet |
| 2018-10-29 | River of the underworld |
| 2018-10-17 | River in which Achilles was dipped |
| 2018-08-04 | It goes to hell |
| 2018-07-19 | Band with the top 10 hits "Lady" and "Babe" |
| 2018-04-22 | Boundary between the earth and the underworld, in myth |
| 2018-03-27 | River to Hades |
| 2017-07-14 | Moon of Pluto discovered in 2012 |
| 2016-11-18 | Something crossed in "The Divine Comedy" |
| 2016-08-23 | One hell of a river? |
| 2016-08-03 | River crossed by Orpheus |
| 2016-06-06 | River to Hades |
| 2016-05-03 | Underworld river |
| 2015-07-26 | River with a "dreadful shore," in Shakespeare |
| 2015-07-14 | River to Hades |
| 2014-11-05 | River ferried by Charon |
| 2014-09-09 | River to 16-Across |
| 2014-01-23 | Boundary river |
| 2013-12-08 | Zeus swore oaths upon it |
| 2013-11-28 | Mother of Nike, in Greek myth |
| 2013-11-19 | Moon of 6-Down named for a mythological river |
| 2013-09-16 | River of the underworld, in myth |
| 2013-07-16 | River of Hades |
| 2013-06-28 | Where Achilles was dipped to make him invincible |
| 2012-04-09 | River of Hades |
| 2011-10-23 | Underworld route |
| 2011-10-17 | River of Hades |
| 2011-10-09 | "Mr. Roboto" band, 1983 |
| 2011-09-07 | River ferried by Charon |
| 2011-08-04 | Boundary of myth |
| 2011-05-27 | Gods swear by it |
| 2011-05-24 | "Come Sail Away" band, 1977 |
| 2011-02-03 | Frightful river to cross |
| 2010-10-12 | Dead river? |
| 2010-08-05 | Milton called it "The flood of deadly hate" |
| 2010-02-03 | Charon's river |
| 2010-01-14 | Hit 1970s-'90s band with a mythological name |
| 2009-12-28 | Hellish river |
| 2009-11-28 | Final course? |
| 2009-06-09 | River of Hades |
| 2009-02-24 | River of Hades |
| 2008-08-10 | Charon's workplace |
| 2008-06-26 | It circles Hades nine times |
| 2008-06-20 | Course for the dead? |
| 2008-06-09 | River of Hades |
| 2007-11-09 | Deep river? |
| 2006-10-26 | Classic rock group with a name from Greek myth |
| 2006-06-14 | Charon's river |
| 2006-05-04 | Band with the 1979 hit "Babe" |
| 2004-12-29 | Charon's river |
| 2004-12-13 | River to the underworld |
| 2004-01-28 | Charon crossed it |
| 2004-01-25 | Ferry river |
| 2003-09-19 | 1970's-90's rock group with a name from Greek myth |
| 2003-08-20 | Charon crosses it |
| 2003-06-29 | Stream of mythology |
| 2003-05-26 | Underworld river |
| 2003-03-02 | Dead waters |
| 2003-02-20 | River to the underworld |
| 2002-10-29 | Thetis bathed Achilles in it, in myth |
| 2002-10-08 | Charon's river |
| 2002-01-31 | Mythological ferry locale |
| 2002-01-30 | Charon's river |
| 2001-12-12 | Charon's river |
| 2001-09-03 | Charon's river |
| 2001-07-24 | Charon's waterway |
| 2001-04-04 | "The flood of deadly hate": Milton |
| 2000-10-31 | River to Hades |
| 2000-10-15 | River whose name means "hateful" |
| 2000-03-24 | A tenth part of the waters of Oceanus |
| 1999-09-15 | Charon's river |
| 1999-02-16 | Name on which ancient oaths were taken |
| 1998-11-22 | Where Achilles was bathed |
| 1998-04-07 | Crossing for Charon |
| 1998-03-27 | Underworld flower |
| 1997-10-22 | Charon's crossing |
| 1997-09-05 | An oath on it was once held to be inviolable |
| 1997-06-03 | Charon's river |
| 1997-01-22 | Underworld river |
| 1996-08-11 | River of Hell |
| 1996-01-29 | River to the underworld |
| 1995-08-05 | Charon's waterway |
| 1995-07-09 | Charon's river |
| 1994-12-07 | Charon's crossing |
| 1994-11-13 | Charon's river |
| 1994-03-29 | Charon's domain |