Matsya Purana — Division of Bhārata-varṣa
अत्रयो ऽथ भरद्वाजाः प्रस्थलाः सदसेरकाः लम्पकास् तलगानाश्च सैनिकाः सह जाङ्गलैः एते देशा उदीच्यास्तु प्राच्यान्देशान्निबोधत //
atrayo 'tha bharadvājāḥ prasthalāḥ sadaserakāḥ lampakās talagānāśca sainikāḥ saha jāṅgalaiḥ ete deśā udīcyāstu prācyāndeśānnibodhata //
Now, the Atrayas, the Bharadvājas, the Prasthalas, the Sadaserakas, the Lampākas, the Talagānas, and the Sainikas—together with the Jāṅgalas—these are the northern (udīcya) regions. Next, understand the eastern (prācya) countries.
This verse does not discuss Pralaya; it functions as a geographic-ethnographic catalog, classifying certain peoples/regions as “northern (udīcya)” and transitioning to the “eastern (prācya)” list.
Indirectly, such regional lists support a king’s rajadharma by mapping peoples and territories—useful for governance, diplomacy, taxation, and knowing frontier groups—though no direct ethical injunction is stated here.
No Vāstu or ritual procedure is specified; the significance is classificatory—preserving traditional knowledge of janapadas/tribes that later informs pilgrimage routes, territorial descriptions, and temple-land endowment records.