It is The famous activity at Tiruvannamalai … Full moon day is the auspicious day so heavy crowd.

Never seen like this before!
Last night around 200,000 people were walking together around the holy mountain Arunachala.
It looked like the flow of a river.
As soon as we joined that flow, the tremendous energy carried us away,
so we kept walking 14 km for 5 hours til coming back to the same spot.

“A silent, slow, barefooted 14 km. walk or girivalam around Arunachala is a benefit both to physical health and to spiritual upliftment. Since very ancient times devotees of Shiva in South India have stayed here and benefitted by communion with the Holy Hill. The most famous recent sage was Sri Ramana Maharshi …”