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An Indian Hindu holy man, or Naga Sadhu, swings his head as he bathes at Sangam, the confluence of the rivers Ganges, Yamuna and mythical Saraswati, during the royal bath on Makar Sankranti at the start of the Maha Kumbh Mela in Allahabad, India, Monday, Jan. 14, 2013. Millions of Hindu pilgrims are expected to take part in the large religious congregation that lasts more than 50 days on the banks of Sangam during the Maha Kumbh Mela in January 2013, which falls every 12th year. (AP Photo/Kevin Frayer)

India's Kumbh Mela festival

An estimated 30 million devotees were expected to take a dip at the

Sangam, the confluence of three rivers — the Ganges, the Yamuna and the

mythical Saraswati — one of the holiest bathing days of the Kumbh Mela, or Pitcher Festival. The festival lasts 55 days and is one of the world's largest religious gatherings.