The Kumbh Mela festival, the largest religious gathering in the world, has begun in the northern Indian city of Prayagraj.

India began on Monday its Maha Kumbh Mela, or Great Pitcher Festival, which is expected to draw more than 400 million visitors to the northern city of Prayagraj over six weeks, making for the largest gathering of humanity in the world.

Millions of Hindus have arrived at Prayagraj in the northern Indian state of Uttar Pradesh for the Maha Kumbh Mela, touted as one of the largest religious gatherings in the world. Over the next three weeks,