Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 19

Sanskrit:

एवं जम्बूफलानामत्युच्चनिपातविशीर्णानामनस्थिप्रायाणामिभकायनिभानां रसेन जम्बू नाम नदी मेरुमन्दरशिखरादयुतयोजनादवनितले निपतन्ती दक्षिणेनात्मानं यावदिलावृतमुपस्यन्दयति ॥ १९ ॥

ITRANS:

evaṁ jambū-phalānām atyucca-nipāta-viśīrṇānām anasthi-prāyāṇām ibha-kāya-nibhānāṁ rasena jambū nāma nadī meru-mandara-śikharād ayuta-yojanād avani-tale nipatantī dakṣiṇenātmānaṁ yāvad ilāvṛtam upasyandayati.

Translation:

Similarly, the fruits of the jambū tree, which are full of pulp and have very small seeds, fall from a great height and break to pieces. Those fruits are the size of elephants, and the juice gliding from them becomes a river named Jambū-nadī. This river falls a distance of 10,000 yojanas, from the summit of Merumandara to the southern side of Ilāvṛta, and floods the entire land of Ilāvṛta with juice.

Purport:

We can only imagine how much juice there might be in a fruit that is the size of an elephant but has a very tiny seed. Naturally the juice from the broken jambū fruits forms waterfalls and floods the entire land of Ilāvṛta. That juice produces an immense quantity of gold, as will be explained in the next verses.