Historical clue formulations

• Longest river entirely in Switzerland — 2023-02-01
• Swiss waterway — 2017-10-18
• River near the start of an alphabetical list — 2017-09-10
• Swiss river to the Rhine — 2015-09-08
• Swiss river — 2014-10-07
• Swiss river — 2014-09-23
• Alpine stream — 2014-04-13
• River forming the Handegg waterfall — 2013-05-25
• Switzerland's ___ Gorge — 2013-04-18
• Bern's river — 2013-04-10
• Alpine stream — 2013-01-19
• Swiss river to the Rhine — 2012-08-20
• Swiss stream — 2012-02-10
• Berne's river — 2011-02-01
• Swiss river to the Rhine — 2011-01-11
• Swiss river — 2010-10-26
• River past Solothurn — 2010-04-09
• River to the Rhine — 2007-07-09
• River to the Rhine — 2007-05-02
• The Lake of Thun is a widening of its course — 2007-04-07
• Rhine tributary — 2007-03-08
• Swiss river to the Rhine — 2006-10-02
• Berne's river — 2005-12-21
• Swiss river to the Rhine — 2005-12-19
• Berne's river — 2005-11-29
• Swiss stream — 2005-07-20
• Swiss river — 2005-06-14
• Berne's river — 2004-05-26
• Rhine feeder — 2003-05-07
• Rhein feeder — 2002-10-23
• Swiss stream — 2002-08-11
• Swiss stream — 2002-06-14
• Swiss stream — 2002-05-16
• Berne sight — 2002-05-09
• Rhein feeder — 2002-03-22
• Swiss river — 2002-03-17
• Alpine river — 2001-09-16
• Alpine stream — 2001-08-26
• Thun's river — 2001-05-24
• River to the Rhine — 2000-04-26
• Rhine tributary — 2000-01-28
• Berne's river — 1999-11-11
• River to the Rhine — 1998-05-23
• Rhine feeder — 1997-12-14
• Rhine feeder — 1997-03-29
• Swiss river — 1997-03-07
• Berne's river — 1996-10-01
• Thun's river — 1996-08-23
• Alpine river — 1996-04-26
• Swiss river — 1996-03-13