A spiritual group said that about 500 activists will cycle all the way to the Bay of Bengal in support of a clean Ganga.
Some 100 cyclists began the campaign from Uttarakhand on Tuesday. They will be joined by 100 cyclists each in Uttar Pradesh, Jharkhand, Bihar and West Bengal, the Gayatri Parivar said.
"The cycle rally will cover the entire route of the Ganges," a Gayatri Parivar spokesman told IANS. The river, considered holy by Hindus, covers some 2,500 km through five states before flowing into the Bay of Bengal.
"It is very important to create awareness among the people living on the banks of this holy river," he said. "The cyclists will move to every village and town from Gangotri to Ganga Sagar in West Bengal," he added. The cyclists will also plant trees along the banks of the Ganges.