Historical clue formulations

• Victoria Falls river — 2021-10-03
• River through Victoria Falls — 2020-10-30
• River with Victoria Falls — 2018-12-15
• Victoria Falls river — 2012-08-08
• Africa's fourth-longest river and site of Victoria Falls — 2009-09-28
• Victoria Falls river — 2008-04-15
• Africa's fourth-longest river — 1994-06-22