According to Koorm Puran, Prayagmandal covered an area of 5 yojanas (about 40 kms.) and in Matsya Puran it is mentioned that it extends from Pratishthana to the pond of Vasuki and as fa as the abodes of the Nagas (Kumbala, Ashvatara and Bahumulaka), places not identified due to the lack of evidence. That Vasuki is Nag Vasuki Temple in Daraganj. It is on the bank of Ganga and an annual fair is held on occasion of Nag Panchami.