The festival known for ritualistic cleansing in pious rivers is the Kumbh Mela in India. This grand pilgrimage is centered around bathing in sacred rivers like the Ganges, Yamuna, and Sarasvati. Participants believe that these ablutions cleanse sins and promote spiritual rebirth. The Kumbh Mela attracts millions, and its significance is deeply rooted in Hindu tradition, focusing on faith, community, and the devotion of believers seeking enlightenment through this transformative experience.