Matsya Purana — Division of Bhārata-varṣa
तेषां परे जनपदा दक्षिणापथवासिनः पाण्ड्याश्च केरलाश्चैव चोलाः कुल्यास्तथैव च //
teṣāṃ pare janapadā dakṣiṇāpathavāsinaḥ pāṇḍyāśca keralāścaiva colāḥ kulyāstathaiva ca //
Beyond them are the provinces of the Dakṣiṇāpatha (the southern route/Deccan): the Pāṇḍyas, the Keralas, the Colas, and likewise the Kulyas.
This verse does not describe Pralaya; it is a geographic-ethnographic listing of southern (Dakṣiṇāpatha) janapadas within Bhārata-varṣa.
Indirectly, it supports rajadharma by mapping recognized realms and peoples—useful for a king’s understanding of territories, diplomacy, pilgrimage routes, and governance across regions named in the Purāṇic world-description.
No explicit Vāstu or ritual rule appears here; the practical takeaway is locational context—such janapada lists are often used to situate tīrthas, temple traditions, and regional ritual lineages in later passages.