Matsya Purana — The Greatness of Prayaga and Allied Tirthas
त्रीणि चाप्यग्निकुण्डानि येषां मध्ये तु जाह्नवी प्रयागादभिनिष्क्रान्ता सर्वतीर्थनमस्कृता //
trīṇi cāpyagnikuṇḍāni yeṣāṃ madhye tu jāhnavī prayāgādabhiniṣkrāntā sarvatīrthanamaskṛtā //
There are also three Agni-kuṇḍas (sacred fire-pits); and in their midst flows the Jāhnavī (Gaṅgā). Emerging from Prayāga, she is revered—one to whom all tīrthas (holy fords) offer homage.
This verse is not about Pralaya; it belongs to tīrtha-mahātmya, praising Prayāga and the Gaṅgā’s sanctity, presenting her as supreme among sacred places.
It supports the dharma of pilgrimage and ritual merit: a householder or ruler gains religious merit by honoring major tīrthas like Prayāga and venerating the Gaṅgā, integrating public piety with personal vows and offerings.
The mention of three agni-kuṇḍas points to a ritual landscape—designated fire-altars/basins used for offerings—indicating that sacred sites are marked not only by rivers but also by structured yajña installations.