Historical clue formulations

• River through three of the 10 largest cities of Russia — 2023-11-14
• Russian waterway famed for its sturgeon fishery — 2022-11-01
• Europe's longest river — 2018-10-22
• Longest river in Europe — 2018-01-02
• Gorky Reservoir river — 2017-11-03
• River to the Caspian Sea — 2017-10-03
• Europe's longest river — 2013-04-08
• River to the Caspian — 2008-12-15
• One end of the Moscow Canal — 2008-12-04
• Europe's longest river — 2008-08-10
• One end of the Moscow Canal — 2007-05-20
• Vital Russian route — 2006-12-03
• "Mighty stream so deep and wide," in song — 2005-08-21
• River connected by canal to the Don — 2005-05-08
• Europe's longest river — 2003-03-09
• Longest river of Europe — 2001-07-02
• River to the Rybinsk Reservoir — 2000-03-19
• Longest river in Europe — 1999-10-12
• Important caviar source, with "the" — 1997-04-26
• Rybinsk Reservoir site — 1994-03-06