Jahnu Muni Ashram

As Nityananda spoke, they went to Jannagara where they saw the enchanting hermitage of Jahnu Muni. Nityananda Prabhu explained, “This enchanting place named Jahnudvipa is known as Bhadravana. At this place, Jahnu Muni underwent penances and received darsana of the golden form of Gauranga.
“Jahnu Muni was sitting here chanting his Gayatri mantra. when his acamana cup fell into the Bhagirathi and was swept away by the currents. He opened his mouth and drank all the water in one gulp. King Bhagiratha thought, ‘Where has the Ganges gone?’ He concluded that Jahnu Muni had drunk the Ganges. The king was overwhelmed with anxiety and worshiped the muni for several days. The muni then released the Ganges from his body. Because of this incident, the Ganges is known as Jāhnavī, the daughter of Jahnu, throughout the world.
“Sometime later, Bhisma, the son of Ganga, came here to see Jahnu, his grandfather. Jahnu was very pleased with Bhīṣma and kept him here for many days. At this place, Bhisma learned the highest knowledge, which he in turn taught to Yudhisthira at Kurukṣetra. By living in Navadvīpa, Bhīṣma attained devotional service and therefore is counted amongst the great Vaiṣṇavas. Therefore this dvīpa is the greatest deliverer. Whoever lives here is always fortunate.”
That day, Nityananda and His associates stayed at a devotee’s house in Jahnudvipa. Early the next morning the Lord led the devotees on to Modadrumadvipa.
Bhaktivinoda, whose only pride is the lotus feet of Jahnavā and Nitai, sings the glories of Navadvipa.
(Sri Navadvipa-Dhama-Mahatmya, Chapter 13)

Then Balarama, accompanied by his ministers such as Uddhava, went to Jahnu-tirtha, where the Ganges appeared from Jahnu Muni’s right ear after he swallowed the river. Thus Ganges takes her name Jahnavi, having emerged from the ear of the great brāhmaṇa Jahnu Muni.
(Sri Navadvipa-Dhama-Mahatmya, Pramana-Khanda, Chapter 3)

The son of Śrutāyu was Vasumān; the son of Satyāyu, Śrutañjaya; the son of Raya, Eka; the son of Jaya, Amita; and the son of Vijaya, Bhīma. The son of Bhīma was Kāñcana; the son of Kāñcana was Hotraka; and the son of Hotraka was Jahnu, who drank all the water of the Ganges in one sip.
(SB 9.15.2-3)