Matsya Purana — Glory of Tīrtha-Śrāddha: Best Times
विन्ध्ययोगश्च गङ्गायास् तथा नदीतटं शुभम् कुब्जाभ्रं तु तथा तीर्थम् उर्वशीपुलिनं तथा //
vindhyayogaśca gaṅgāyās tathā nadītaṭaṃ śubham kubjābhraṃ tu tathā tīrtham urvaśīpulinaṃ tathā //
Also praised are the Gaṅgā’s confluence in the Vindhya region (Vindhya-yoga), the auspicious riverbank, the sacred ford called Kubjābhra, and likewise the sandy river-terrace known as Urvaśī-pulina.
This verse does not describe Pralaya; it catalogs Gaṅgā-related tīrthas and auspicious riverbanks, emphasizing sacred geography rather than cosmic dissolution.
By naming tīrthas and sacred riverbanks, it supports the Purāṇic duty of householders and rulers to uphold dharma through pilgrimage, ritual bathing, and patronage of holy places—acts believed to purify and stabilize social-religious order.
The ritual takeaway is the sanctity of specific Gaṅgā locations for tīrtha-snāna (pilgrimage bathing) and worship; while no building rule is stated, such named tīrthas commonly function as focal points for ghāṭas, shrines, and regulated riverbank rites.