Matsya Purana — Division of Bhārata-varṣa
मध्यमं तन्मया प्रोक्तं नाम्ना वर्षमिलावृतम् न तत्र सूर्यस्तपति न च जानन्ति मानवाः //
madhyamaṃ tanmayā proktaṃ nāmnā varṣamilāvṛtam na tatra sūryastapati na ca jānanti mānavāḥ //
That central region I have described is the land called Ilāvṛta-varṣa. There the Sun does not scorch, and human beings are not found (do not dwell there).
This verse is not about Pralaya; it belongs to cosmographic description, identifying Ilāvṛta-varṣa as a special central region with conditions unlike ordinary human realms.
Indirectly, it frames the human realm as distinct from divine or extraordinary regions; the king/householder’s dharma is to be practiced in human-inhabited lands, not in inaccessible cosmological zones like Ilāvṛta.
No direct Vāstu or ritual rule is stated; the takeaway is sacred-geographical—Ilāvṛta is portrayed as a unique central zone, often treated as non-human or exceptional in Purāṇic cosmology.