Matsya Purana — Procedure for Going to Prayaga and the Greatness of the Ganga
उत्तरेण प्रतिष्ठानाद् भागीरथ्यास्तु पूर्वतः हंसप्रपतनं नाम तीर्थं त्रैलोक्यविश्रुतम् //
uttareṇa pratiṣṭhānād bhāgīrathyāstu pūrvataḥ haṃsaprapatanaṃ nāma tīrthaṃ trailokyaviśrutam //
To the north of Pratiṣṭhāna, and to the east of the Bhāgīrathī, lies the sacred ford called Haṃsaprapatana—celebrated throughout the three worlds.
This verse does not discuss pralaya; it belongs to a tīrtha-māhātmya style passage mapping sacred geography and identifying a famed pilgrimage site.
By naming and locating a renowned tīrtha, the verse supports the Purāṇic ethic that householders (and kings who set public religious standards) should honor sacred places through pilgrimage, charity, and ritual bathing—acts believed to uphold dharma and social merit.
Ritually, it indicates a designated tīrtha suitable for pilgrimage practices (especially snāna—sacred bathing). Architecturally, no specific vāstu or temple-building rule is stated, but such tīrthas commonly anchor shrines, ghāṭas, and regulated ritual spaces in Purāṇic tradition.