Bhagavatapurana 5.16.19

5.16.19

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evaṃ jambū-phalānām atyucca-nipāta-viśīrṇānām anasthi-prāyāṇām ibha-kāya-nibhānāṃ rasena jambū nāma nadī meru-mandara-śikharād ayuta-yojanād avani-tale nipatantī dakṣiṇenātmānaṃ yāvad ilāvṛtam upasyandayati //

19. Thus also from the juice of the Jambu as big as the elephants mostly containing very fine seeds that break into pieces by their falling from a great height, the river called Jambu is formed and it falls down from the tops of Meru Mandara to a depth of ten thousand yojanas; and then flowing towards the south, moistens that portion of Ilavrita.