Considered an integral part of the Kumbh Mela, ''akharas'' set up at the venue virtually steal the show.
The akharas were formed following efforts by the eighth century Hindu seer Adi Shankaracharya to unite organisations of ascetics to protect the sanatan way of life.
Each akhara houses followers of similar religious customs, views and ideologies, who specialise in both scriptures and armaments.
According to Akhil Bharatiya Akhara Parishad (ABAP) president Narendra Giri, akharas may be categorised into three categories based on the deities they worship -- Shaiva, Vaishnava and Udaseen.
Of the 13 akharas, seven are Shaiva and three each are Vaishnava and Udaseen, Mr Giri said.
The word akhara came from the word akhand which means indivisible, he said.
Shaiva Akaharas that worship Lord Shiva in various forms are Shri Panchayati Akhara Mahanirvani (Allahabad), Shri Panch Atal Akhara (Varanasi), Shri Panchayati Akhara Niranjani (Allahabad), Taponidhi Shri Anand Akhara Panchayati (Nasik), Shri Panchdashnaam Juna Akhara (Varanasi), Shri Panchdashnaam Aavahan Akhara (Varanasi) and Shri Panchdashnaam Panchgani Akhara (Junagadh, Gujarat).
For Vaishnava Akharas -- Digambar Ani, Shri Nirvani Ani and Shri Nirmohi Ani, Lord Vishnu is the favoured deity.
Chandra Dev, the son of the first Sikh Guru, is considered as the founder of the Udaseen Akhara, whose followers offer their prayer to ''Om''.
Three Udaseen Akharas are Shri Panchayati Bada Udaseen Akhara, Shri Panchayati Akhara Naya Udaseen and Shri Nirmal Panchayati Akhara.
A five-member committee looks after the order and operations of the organisations.
In terms of strength, Juna Akhara is the largest, followed by Niranjani and Mahanirvani Akharas.
The Akhil Bharatiya Akhara Parishad has been established to promote mutual harmony and settle any dispute among the akharas.
Mr Giri told news agency PTI, "There are three shahi snaans (royal bathing days) out of the six bathing dates during the Kumbh Mela. The bathing will commence at around 4 am and will continue till 5 pm."
The 2019 Kumbh Mela will commence on January 15 on Makar Sankranti which will be the first bathing day. Mahashivratri on March 4 will mark the last bathing day.
More than 12 crore people are expected to take part in the event over the next 50 days.
Devotees take holy dips at the sacred confluence of the Ganga, the Yamuna and the mythical Saraswati.
There will be magnificent processions of seers and their disciples, and members of various akharas to take part in the ritual of shahi snan, also known as rajyogi snan, at the start of Kumbh.
Shahi snan is the central highlight of the Kumbh Mela and the most important part of the celebration. It is only after the completion of shahi snan that people are allowed to take the holy dip.
The auspicious bathing days of the 2019 Kumbh Mela are Makar Sankranti (January 15), Paush Poornima (January 21), Mauni Amawasya (February 4), Basant Panchami (February 10), Maghi Poornima (February 19) and Mahashivratri (March 4).
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