Historical clue formulations

• St. Petersburg's river — 2018-12-23
• St. Petersburg's river — 2014-10-01
• River that passes by the Hermitage — 2014-07-12
• St. Petersburg's river — 2014-06-04
• Gulf of Finland feeder — 2013-01-24
• River through St. Petersburg — 2012-01-31
• It has banks in St. Petersburg — 2011-11-06
• River of St. Petersburg — 2010-05-09
• St. Petersburg's river — 2005-11-09
• St. Petersburg's river — 2004-08-22
• St. Petersburg's river — 2003-08-28
• St. Petersburg's river — 2001-12-09
• St. Petersburg's river — 2001-04-06
• St. Petersburg's river — 2000-11-05
• St. Petersburg's river — 2000-09-28
• River connected by canal to the Volga — 2000-06-25
• Gulf of Finland feeder — 1999-11-14
• Gulf of Finland feeder — 1998-05-10
• Winter Palace river — 1998-04-29
• St. Petersburg's river — 1996-05-17
• St. Petersburg's river — 1994-10-05
• St. Petersburg's river — 1994-06-01