Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
आम्बिकेयस्य मैनाकं क्षेमकं चैव तत्कृतम् केसरः पर्वतस्यापि महाद्रुममिति स्मृतम् तदेव धवमित्युक्तं वर्षं विभ्राजसंज्ञितम् //
āmbikeyasya mainākaṃ kṣemakaṃ caiva tatkṛtam kesaraḥ parvatasyāpi mahādrumamiti smṛtam tadeva dhavamityuktaṃ varṣaṃ vibhrājasaṃjñitam //
For Ambikeya there is Maināka, and also Kṣemaka, made (assigned) for him. Kesara too is remembered as a mountain, and Mahādruma as well. That very (region) is also called Dhava; the varṣa is known by the name Vibhrāja.
This verse is not about Pralaya; it belongs to the Matsya Purana’s cosmographical cataloging, naming specific mountains and a varṣa (regional division) such as Vibhrāja.
Directly it does not prescribe duties; indirectly, such geographic enumerations support the Purāṇic worldview used in royal administration, pilgrimage mapping, and the cultural idea of ruling/inhabiting a divinely ordered landscape.
No explicit Vāstu or ritual rule appears here; the significance is primarily sacred geography—toponyms like Maināka and the varṣa Vibhrāja that may frame later tīrtha (pilgrimage) or regional ritual contexts.