Led by ITBP Commandant Surendra Khatri, the expedition was flagged off by Bharti from Devprayag in Tehri district where the Ganga's tributaries Alaknanda and Bhagirathi merge into the mighty river.
Underlining the need to keep the flow of the river unobstructed to keep it clean, she said only run-of-the-river dam projects will be given clearance in the future.
The 46-member expedition team will pass through five states including Uttarakhand, Uttar Pradesh, Bihar, Jharkhand and West Bengal before its ceremonious conclusion in Ganga Sagar (WB) by Union Home Minister Rajnath Singh on December 12.