| 2022-05-28 | River of Hades |
| 2021-09-27 | River of forgetfulness, in myth |
| 2019-12-28 | One of the five rivers of 56-Across |
| 2018-07-06 | River of forgetfulness, in myth |
| 2016-09-30 | River of forgetfulness |
| 2016-01-30 | River of myth where one drinks to forget |
| 2013-12-15 | River of forgetfulness in Hades |
| 2013-01-30 | Hades' river of forgetfulness |
| 2012-06-13 | River of Hades |
| 2012-04-13 | River that the dead drank from, in myth |
| 2012-04-02 | River through Hades |
| 2008-05-30 | River in Hades |
| 2007-01-12 | River in "The Divine Comedy" |
| 2007-01-11 | Oblivion |
| 2005-09-30 | River in Hades |
| 2005-06-09 | River in Dante's "Inferno" |
| 2005-06-06 | River of oblivion |
| 2005-05-24 | River in Hades |
| 2003-11-15 | River of Hades |
| 2002-07-10 | Oblivion |
| 2000-11-21 | River in Hades |
| 1998-05-06 | River in Hades |
| 1997-08-08 | Oblivion |
| 1996-12-05 | River of forgetfulness |
| 1996-08-13 | River of forgetfulness |
| 1995-07-29 | River of forgetfulness |
| 1994-11-05 | Underworld river |