Matsya Purana — Lineage of the Pitṛs
गङ्गायां मङ्गला नाम विमिला पुरुषोत्तमे विपाशायाम् अमोघाक्षी पाटला पुण्ड्रवर्धने //
gaṅgāyāṃ maṅgalā nāma vimilā puruṣottame vipāśāyām amoghākṣī pāṭalā puṇḍravardhane //
On the Gaṅgā the Goddess is named Maṅgalā; at Puruṣottama she is Vimalā; on the Vipāśā she is Amoghākṣī; and in Puṇḍravardhana she is Pāṭalā.
This verse does not discuss Pralaya; it catalogs sacred rivers/regions and their presiding goddesses, emphasizing pilgrimage geography rather than cosmic dissolution.
By identifying tirthas and their deities, it supports the householder/kingly duty of maintaining dharma through pilgrimage, honoring local cults, and supporting worship at renowned sacred sites.
The ritual takeaway is deity-association with specific locales: such verses guide where offerings, vows, and worship are to be directed (often informing temple focus and local shrine traditions), though no explicit Vastu rule is stated here.