Historical clue formulations

• Asia's ___ Darya River — 2018-03-30
• ___ Darya — 2016-10-27
• Asia's ___ Darya River — 2016-09-17
• ___ Darya (river of central 58-Down) — 2011-11-16
• ___ Darya (river to the Aral Sea) — 2010-05-27
• ___ Darya (Aral Sea feeder) — 2006-06-14
• Asia's ___ Darya river — 2005-11-27
• ___ Darya (Asian river) — 2004-06-02
• ___ Darya river — 2003-09-21
• ___ Darya (Asian river) — 2001-09-09
• ___ Darya (river to the Aral Sea) — 2001-08-24
• ___ Darya (Asian river) — 1998-03-28