Historical clue formulations

• China/North Korea border river — 2021-03-25
• Asian river whose name is one letter away from an Ivy League college — 2017-02-07
• River to Korea Bay — 2012-01-29
• River to Korea Bay — 2010-02-03
• River to Korea Bay — 2006-02-13
• Korea Bay feeder — 2004-02-20
• Korea Bay feeder — 2003-09-14
• Korea Bay feeder — 2002-10-10
• Korea Bay feeder — 2002-09-15
• Korean border river — 2002-08-08
• China/Korea border river — 2002-03-05
• River into Korea Bay — 2001-04-09
• Manchurian border river — 2001-02-07
• Korea Bay feeder — 1999-02-11
• Manchurian border river — 1998-12-13
• River crossed in the Korean War — 1998-06-05
• Supung Dam site — 1995-10-29
• Asian border river — 1995-10-22
• Manchurian border river — 1994-12-11