Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
क्रौञ्चः सप्तर्षिशैलश्च धूम्रवर्णश्च पर्वतः एते चान्ये च गिरयो देशा जनपदास्तथा //
krauñcaḥ saptarṣiśailaśca dhūmravarṇaśca parvataḥ ete cānye ca girayo deśā janapadāstathā //
Krauñca, Saptarṣi-śaila, and the mountain called Dhūmravarṇa—these, and many other mountains, as well as regions and settled countries (janapadas), are thus enumerated.
This verse is not describing pralaya; it belongs to a cosmographic catalogue, naming mountains and inhabited regions as part of the Purāṇic mapping of the world.
Indirectly, it frames the idea of janapadas (settled realms) that a king protects and administers; the verse functions as geographic context rather than a direct dharma injunction.
No explicit Vāstu or ritual rule is stated; the significance is contextual—sacred geography (mountains/regions) often anchors pilgrimage networks and regional ritual identity in Purāṇic tradition.