Matsya Purana — Division of Bhārata-varṣa
अङ्गा वङ्गा मद्गुरका अन्तर्गिरिबहिर्गिरी ततः प्लवंगमातंगा यमका मल्लवर्णकाः सुह्मोत्तराः प्रविजया मार्गवा गेयमालवाः //
aṅgā vaṅgā madgurakā antargiribahirgirī tataḥ plavaṃgamātaṃgā yamakā mallavarṇakāḥ suhmottarāḥ pravijayā mārgavā geyamālavāḥ //
The Angas, the Vangas, and the Madgurakas; those dwelling within the mountains and those outside the mountains; then the Plavaṅgas and Mātaṅgas; the Yamakas; the Mallavarṇakas; the Suhmas and the Uttaras; the Pravijayas; the Mārgavas; and the Geya-Mālavās.
This verse does not discuss Pralaya; it is a geographic-ethnographic catalogue naming janapadas (regions/peoples) of Bharata and nearby areas.
Indirectly, such catalogues help frame a king’s realm, neighbors, and frontier peoples—useful for rajadharma themes like governance, taxation, alliances, and protection of diverse communities across hills and plains.
No direct Vastu or ritual rule is stated; however, the distinction of ‘within the mountains’ and ‘outside the mountains’ can be read as a geographic cue relevant to settlement planning and regional temple styles discussed elsewhere in the Matsya Purana.