Matsya Purana — Kailasa
इन्द्रद्वीपसमीपे तु प्रविष्टा लवणोदधिम् ततस्तु पावनी प्रायात् प्राचीमाशां जवेन तु //
indradvīpasamīpe tu praviṣṭā lavaṇodadhim tatastu pāvanī prāyāt prācīmāśāṃ javena tu //
Near Indradvīpa it entered the salt ocean; thereafter the river Pāvanī swiftly proceeded toward the eastern quarter.
It does not describe Pralaya directly; it belongs to cosmography/sacred geography, mapping how a named river (Pāvanī) connects to the salt ocean and then moves eastward.
Indirectly, it supports dharmic life through tīrtha-awareness: kings and householders are encouraged in Purāṇic tradition to protect waterways and to undertake regulated pilgrimage and ritual bathing at sacred rivers and coasts.
Ritually, it situates a sacred river’s confluence with the sea—typical sites for snāna, tarpaṇa, and tīrtha-observances; such geography also guides temple/tīrtha placement near river mouths and coastal sacred zones.