Historical clue formulations

• Spain's longest river — 2024-08-22
• Longest river entirely within Spain — 2023-05-17
• River through Spain — 2020-05-28
• River that rises in the Cantabrian Mountains — 2018-05-06
• Second-longest river in Iberia — 2016-09-06
• Iberian river — 2014-01-21
• River of Iberia — 2013-04-18
• Iberian Peninsula river — 2013-03-26
• Spain's longest river — 2012-12-24
• River of Aragón — 2010-11-09
• River through Castile and León — 2010-09-16
• Spain's longest river — 2010-09-06
• River through Logroño and Aragon — 2010-02-18
• River that was the ancient dividing line between Rome and Carthage — 2010-02-04
• River to the Mediterranean — 2010-01-06
• River of Spain — 2009-04-14
• The Aragón River flows into it — 2009-01-18
• River that rises in Cantabria — 2008-09-21
• Longest Spanish river — 2008-05-26
• It rises in the Cantabrian Mountains — 2008-03-08
• River of Spain — 2008-02-19
• Battle of the ___, in the Spanish Civil War — 2007-08-16
• Spanish river to the Mediterranean — 2007-05-07
• Saragossa is on it — 2006-12-22
• River whose delta is Cape Tortosa — 2006-07-23
• River of Spain — 2006-07-03
• River of Spain — 2006-02-06
• Longest river of Spain — 2005-11-07
• River of Aragón — 2005-10-25
• Saragossa's river — 2005-08-24
• Miranda de ___, Spain — 2004-12-18
• River rising in the Cantabrian Mountains — 2004-01-30
• Saragossa's river — 2004-01-13
• Spain's second-longest river — 2003-08-05
• Saragossa's stream — 2003-07-31
• Rain in Spain collector — 2002-11-20
• River through Zaragoza — 2002-09-29
• Aragón River's outlet — 2001-11-18
• Zaragoza's river — 2001-04-14
• River of Spain — 2001-01-29
• River of Aragón — 2000-08-23
• Catalan river — 2000-06-22
• River of Aragón — 2000-03-28
• Zaragoza's river — 2000-03-16
• Tortosa's river — 1999-12-19
• River in Spain — 1998-04-01
• River through Aragón — 1998-02-22
• River through Aragon — 1997-03-27
• River in Spain — 1997-01-01
• The Aragon flows into it — 1996-11-22