Matsya Purana — Division of Bhārata-varṣa
कुथप्रावरणाश्चैव ऊर्णादवाः समुद्गकाः त्रिगर्ता मण्डलाश्चैव किराताश्चामरैः सह //
kuthaprāvaraṇāścaiva ūrṇādavāḥ samudgakāḥ trigartā maṇḍalāścaiva kirātāścāmaraiḥ saha //
And also the Kuthaprāvaraṇas, the Ūrṇādavas, the Samudgakas, the Trigartas, the Maṇḍalas, and the Kirātas together with the Āmaras are to be understood as among the peoples of the regions being enumerated.
Nothing directly—this verse is an ethnographic/geographical catalogue of peoples and regions rather than a Pralaya (cosmic dissolution) passage.
Indirectly, it supports rajadharma by mapping the human landscape—identifying frontier peoples and regions a king might govern, ally with, trade with, or defend against, a common Purāṇic function of janapada lists.
No explicit Vāstu or ritual rule is stated here; the verse functions as a regional/tribal enumeration rather than temple-building or rite procedure.