Matsya Purana — Pitṛ Worlds
लोकास्तु मानसा नाम ब्रह्माण्डोपरि संस्थिताः येषां तु मानसी कन्या नर्मदा नाम विश्रुता //
lokāstu mānasā nāma brahmāṇḍopari saṃsthitāḥ yeṣāṃ tu mānasī kanyā narmadā nāma viśrutā //
There are worlds known as the Mānasas, situated above the cosmic egg (Brahmāṇḍa). From them was born a mind-born daughter, renowned by the name Narmadā.
It reflects cosmological mapping rather than Pralaya: it locates “Mānasā” worlds above the Brahmāṇḍa and presents Narmadā as a mind-born (mānasī) manifestation, implying supra-material origins within creation.
Indirectly, it elevates Narmadā’s sanctity by describing her transcendent origin; in Matsya Purana ethics this supports royal/householder duties of tīrtha-respect—supporting pilgrimage routes, protecting rivers, and performing purificatory rites connected with sacred waters.
The verse itself is not Vāstu-technical, but it grounds ritual significance: Narmadā’s divine origin supports river-based rites (snāna, tarpaṇa, tīrtha-yātrā) and the later Puranic practice of establishing ghāṭas, shrines, and tīrtha-kṣetras along her banks.