Matsya Purana — Division of Bhārata-varṣa
अयं लोकस्तु वै सम्राड् अन्तरिक्षजितां स्मृतः स्वराडसौ स्मृतो लोकः पुनर्वक्ष्यामि विस्तरात् //
ayaṃ lokastu vai samrāḍ antarikṣajitāṃ smṛtaḥ svarāḍasau smṛto lokaḥ punarvakṣyāmi vistarāt //
O sovereign king, this realm is remembered as ‘Samrāṭ’ among those who have conquered the mid-space (antarikṣa). That world is also known as ‘Svarāṭ’. I shall explain it again in detail.
It does not describe pralaya directly; it classifies a ‘loka’ (realm) by traditional names (Samrāṭ/Svarāṭ) and frames a continued cosmological exposition.
The verse addresses a king as the listener and models the Purāṇic ideal: rulers should learn cosmology and sacred geography as part of dharmic governance and right understanding of the universe they protect.
No direct Vāstu or ritual rule appears in this line; its significance is classificatory—naming realms—which often supports later ritual mapping (directions, worlds, and placements) in Purāṇic practice.