Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
शाकद्वीपादिषु त्वेषु सप्त सप्त नगास् त्रिषु ऋज्वायताः प्रतिदिशं निविष्टा वर्षपर्वताः //
śākadvīpādiṣu tveṣu sapta sapta nagās triṣu ṛjvāyatāḥ pratidiśaṃ niviṣṭā varṣaparvatāḥ //
In Śākadvīpa and the other continents, in each of the three divisions there are seven and seven mountain ranges—straight and extended—set in place toward every direction; these are the Varṣa-mountains that mark off the regions.
This verse is not about Pralaya; it belongs to the Matsya Purāṇa’s cosmography and explains how continents are structured by Varṣa-mountains that divide regions.
Indirectly, it supports dharma by presenting an ordered cosmic geography: a king’s realm and rituals are ideally aligned with a well-ordered universe, and pilgrimage/territorial imagination in Purāṇas rests on such mapped divisions.
No direct Vāstu rule is stated, but the idea of orderly directional placement (pratidiśam) echoes the wider Purāṇic preference for directionally aligned layouts in sacred planning and ritual orientation.