Historical clue formulations

• Eurasian plain — 2023-08-14
• Overseas plain — 2019-05-10
• Siberian land feature — 2019-05-09
• Much of Mongolia — 2017-12-17
• "Great" Eurasian region — 2016-05-01
• Onetime home of the Huns — 2015-06-17
• Eurasian plain — 2014-08-13
• Treeless plain — 2013-12-09
• Vast treeless area — 2013-08-29
• Treeless tract — 2011-08-03
• Open grassland — 2011-05-12
• Siberian plain — 2011-04-11
• Plain — 2011-02-06
• Vast treeless plain — 2010-12-13
• Kazakh land feature — 2010-09-05
• Treeless plain — 2008-10-14
• Plain — 2008-04-27
• Part of the Kazakhstan landscape — 2008-04-23
• Grassy expanse — 2007-08-08
• Russian plain — 2005-04-12
• Unforested tract — 2001-08-03
• Treeless tract — 2000-08-09
• Ukrainian geographical feature — 1999-07-10
• Treeless plain — 1999-04-15
• Treeless plain — 1997-03-17
• Treeless tract — 1996-09-01
• Russian plain — 1996-06-03
• Russian grassland — 1994-11-21
• Treeless plain — 1993-12-06