Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
सुवर्णप्रकटं चैव सुवर्णाकरमण्डितम् महानदं च लौहित्यं शैलकाननशोभितम् //
suvarṇaprakaṭaṃ caiva suvarṇākaramaṇḍitam mahānadaṃ ca lauhityaṃ śailakānanaśobhitam //
He also described Suvarṇaprakaṭa, adorned with mines of gold; and the great river Lauhitya, made splendid by its mountains and forest-groves.
This verse is not about Pralaya; it belongs to sacred-geography praise, highlighting rivers and regions as enduring, sanctified features of the world.
Indirectly, it supports dharma through tirtha-oriented life: householders and rulers are encouraged in the Purāṇas to honor sacred rivers/regions via pilgrimage, protection of natural sites, and patronage of holy places.
No explicit Vāstu rule is stated, but the verse frames riverine and mountain-forest settings as auspicious; such descriptions commonly guide where temples, tīrthas, and ritual bathing-ghāṭas are ideally situated.