Historical clue formulations

• River to the Bay of Bengal — 2020-06-30
• Its head is in the Himalayas — 2018-07-24
• River mentioned in the Rig Veda — 2013-06-14
• River to the Bay of Bengal — 2006-04-04
• Destination of some pilgrims — 2000-09-07
• Hindus' holy river — 1997-05-11
• Allahabad's river — 1994-04-03