Matsya Purana — Paurava Genealogy
पञ्चानां चैव पञ्चालान् एताञ्जनपदान्विदुः पञ्चालरक्षिणो ह्य् एते देशानामिति नः श्रुतम् //
pañcānāṃ caiva pañcālān etāñjanapadānviduḥ pañcālarakṣiṇo hy ete deśānāmiti naḥ śrutam //
These are known as the five Pañcālas—these territorial realms (janapadas). Indeed, they are said to be the protectors of these regions; so we have heard.
This verse is not about Pralaya; it belongs to a geographic-political listing, identifying the Pañcālas as five janapadas and describing them as guardians of regions.
By calling certain groups “protectors of the regions,” it echoes the Rajadharma ideal that territories require guardianship—order, defense, and stewardship—functions typically associated with rulers and their allied clans.
No direct Vāstu/ritual rule appears here; the relevance is indirect—janapada classification and regional identity often frame where specific rites, temple traditions, and local administrative customs are practiced.