Historical clue formulations

• Lowlands — 2026-01-29
• Some stream settings — 2025-12-27
• Broad valleys — 2025-04-30
• Low-lying areas — 2020-06-26
• Broad valleys — 2018-05-29
• Low-lying areas — 2018-03-30
• Hills' counterparts — 2016-04-22
• Broad valleys — 2014-12-07
• Broad valleys — 2014-05-07
• Valleys — 2013-09-15
• Areas between hills — 2009-12-09
• Broad valleys — 2008-10-02
• Broad valleys — 2008-06-10
• Locales for streams — 2005-03-12
• Valleys — 2000-11-19
• Broad valleys — 1997-10-20
• Low-lying areas — 1994-10-23