Historical clue formulations

• Word in two African country names — 2024-09-07
• The "C" of D.R.C. — 2021-11-14
• World's deepest river — 2021-06-27
• Neighbor of Burundi — 2018-04-05
• River more than 2,700 miles long that crosses the Equator twice — 2016-12-25
• Neighbor of Gabon — 2013-12-14
• Michael Crichton novel about diamond-hunting — 2012-11-11
• River below the Boyoma Falls — 2008-10-16
• Neighbor of Gabon — 2007-04-25
• Pointe-Noire's home — 2006-08-25
• Zaire, now — 2006-01-31
• Setting of Joseph Conrad's "Heart of Darkness" — 2003-09-20
• Ubangi's outlet — 2001-09-27
• Brazzaville's river — 1994-02-01