Historical clue formulations

• Hollows between hills — 2019-09-24
• Low-lying areas — 2019-06-05
• Places where streams flow — 2019-03-13
• Forum farewells — 2017-05-21
• Rolling landscape features — 2011-07-30
• Low points — 2005-02-19
• Low places — 2002-11-03
• Where streams run — 2001-04-22
• Glens — 2000-01-09
• Lowlands, to poets — 1999-12-28
• Areas between hills — 1998-02-03