Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
आम्बिकेयात्परो रम्यः सर्वौषधिनिषेवितः विभ्राजस्तु समाख्यातः स्फाटिकस्तु महान्गिरिः //
āmbikeyātparo ramyaḥ sarvauṣadhiniṣevitaḥ vibhrājastu samākhyātaḥ sphāṭikastu mahāngiriḥ //
Beyond Ambikeya lies a delightful region, abundant in every kind of medicinal herb. There stands a great mountain known as Vibhrāja, and another mighty peak called Sphāṭika, the Crystal Mountain.
This verse does not discuss Pralaya; it is a topographical description highlighting a region famed for medicinal herbs and notable mountains.
Indirectly, it supports dharma through sacred geography: rulers and householders are encouraged in the Purāṇas to protect resource-rich lands (especially medicinal flora) and to honor pilgrimage landscapes as part of righteous stewardship.
No explicit Vāstu or temple rule is stated; the ritual significance is implicit—such named mountains and herb-rich regions function as tīrtha/kshetra markers, guiding pilgrimage and sacred-site veneration.