Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
चतुर्थः पर्वतो द्रोणो यत्रौषध्यो महागिरौ विशल्यकरणी चैव मृतसंजीवनी तथा //
caturthaḥ parvato droṇo yatrauṣadhyo mahāgirau viśalyakaraṇī caiva mṛtasaṃjīvanī tathā //
The fourth mountain is Droṇa; upon that great peak grow the medicinal herbs—Viśalyakaraṇī, which removes missiles and pain, and Mṛtasaṃjīvanī, the life-restoring herb as well.
This verse does not describe Pralaya; it catalogs a sacred mountain (Droṇa) famed for rare life-saving herbs, emphasizing sacred geography and preservative healing knowledge rather than cosmic dissolution.
Indirectly, it supports the royal and household duty of protection and welfare: knowing life-preserving resources (medicinal herbs) aligns with dharma as public care—especially for rulers responsible for health, disaster response, and sustaining life.
No explicit Vastu or temple rule appears here; the ritual takeaway is the sanctity of specific landscapes—certain mountains are treated as repositories of divine potency (auṣadhi-śakti), often linked to pilgrimage and consecratory traditions.