Matsya Purana — The Observance of Ananta-Tritiya
विन्यसेत्पश्चिमे सौम्यां सदा मदनवासिनीम् वायव्ये पाटलामुग्राम् अन्तरेण ततो ऽप्युमाम् //
vinyasetpaścime saumyāṃ sadā madanavāsinīm vāyavye pāṭalāmugrām antareṇa tato 'pyumām //
One should install the gentle Saumyā in the western quarter—ever as the beloved abode of Madana (Kāma). In the north‑west (vāyavya) one should place the fierce Pāṭalā; and in the intermediate position thereafter, one should place Umā as well.
This verse does not address pralaya; it is a Vastuvidyā instruction on where specific goddess-forms are to be installed within a directional sacred layout.
It frames a practical dharma-duty: patrons (kings/householders) must commission and install deities according to prescribed directional rules so that a shrine, household worship-space, or public temple is ritually correct and auspicious.
It gives dik-vinyāsa (directional placement): Saumyā in the west, Pāṭalā in the northwest, and Umā in an intermediate position—guiding the icon-plan and ritual installation sequence in a temple/mandala.