In the great Padma Purana (Utkala Khanda), compiled by Srila Vyasadev, it has been stated as follows:
sampradaya vibinamshcha mantraste viphala matah
athou kalau bhavishyanti chatvara sampradayane
sri brahma rudra sanaka vaisnava kshiti pavana
chatvaraste kalau bhavyat utkale purushottamat
Translation: “In this age of Kali, all the 4 principal branches of vaisnava paramparas (Krsna-bhakti) namely Sri, Brahma, Rudra and Sanaka will assimilate together in the Land of Utkala at Sri Purushottama Dham and spread the nectar of Krishna-prema throughout the entire world.” And surprisingly it is seen that the great Dandabhanga Bhumi of Lord Caitanya falls exactly within the Pancha Krosha or Atma Mandala (soul portion) of Sri Purushottama Dham.
Then in the 11th Canto of the Srimad-Bhagavatam, it has been mentioned:
krtadisu prajaraajan kalabichhanti sambhavam
kalau khalu bhavishyanti narayana parayanaah
kvachit kvachinmaharaja dravidesu cha bhurishah (38)
taamraparni nadiyatra krtamaala payasvini
kaveri cha mahapunya pratichi cha mahanadi (39)
ye pivanti jalam taasam manuja danujeshwara
praayobhakta bhagavati vasudeve malaashayaah (40)
(Srimad-Bhagavatam, 11th canto, Ch-5, text-38 to 40)
Translation: Oh, king! Even the inhabitants of Satya-yuga desire to take birth in this blessed age of Kali. In this age of Kali, a great number of Vaisnavas will be born especially on the sacred land of Dravida. On this land, we will find the sacred rivers such as Taamrapaani, Krtamala, Kaveri and the most auspicious rivers such as Pratichi (Prachi) and Mahanadi flowing. Oh King, anyone who drinks the water from these rivers will get his heart purified enough in order to receive the most rare gift of Bhagavad-bhakti at the Divine Lotus Feet of Lord Vasudev.
The river Bhargavi is nothing but the expansion (tributary) of the most auspicious and blessed Mahanadi.