Historical clue formulations

• Marshy areas — 2026-07-08
• Swampy areas — 2025-10-27
• Peat sources — 2023-01-28
• Poor-drainage areas — 2022-09-24
• Swamps — 2019-04-27
• Moors — 2017-01-27
• Marshes — 2016-08-04
• Peaty places — 2011-01-14
• Boggy lands — 2007-03-04
• Sloughs — 2006-05-27
• Wetlands — 2004-08-05
• Boggy places — 2004-06-23
• Lowlands — 2004-02-20
• Bogs — 2001-09-30
• Peaty areas — 2000-01-25
• Sloughs — 1999-12-10
• Swampy spots — 1998-01-14
• Marshlands — 1997-10-03
• Peaty areas — 1996-09-01
• Low peaty lands — 1996-08-18
• Lincolnshire locale, with "The" — 1995-11-17