Matsya Purana — Kailasa
मेरोः पार्श्वात्प्रभवति ह्रदश्चन्द्रप्रभो महान् जम्बूश्चैव नदी पुण्या यस्यां जाम्बूनदं स्मृतम् //
meroḥ pārśvātprabhavati hradaścandraprabho mahān jambūścaiva nadī puṇyā yasyāṃ jāmbūnadaṃ smṛtam //
From the flank of Mount Meru arises the great lake called Candraprabha; and also the sacred river Jambū, in which the famed gold known as jāmbūnada is said to be found.
This verse is not about Pralaya; it is a cosmographic note describing sacred features (a lake and a river) originating near Mount Meru within the Purāṇic world-map.
Indirectly, it supports Purāṇic dharma by mapping tīrtha-like sacred geography; kings and householders are encouraged in the Purāṇas to honor such sacred places through pilgrimage, gifts, and ritual purity, though no direct royal duty is stated here.
No Vāstu or temple-building rule is stated; the ritual takeaway is the sanctity (puṇyatva) of the Jambū river-region and its traditional association with jāmbūnada gold, a substance often linked in Purāṇic culture to auspicious gifting and ritual adornment.