More than 120 million Hindu devotees are to visit the northern city of Prayagraj (formerly Allahabad) for the world’s largest religious festival, at the confluence of the Ganges, Yamuna and mythical Saraswati rivers. The Kumbh Mela is a series of ritual baths by Hindu sadhus, or holy men, and other pilgrims at the confluence of three sacred rivers that dates back to at least medieval times. Pilgrims bathe in the river believing it cleanses them of their sins and ends their process of reincarnation