Matsya Purana — Glory of Tīrtha-Śrāddha: Best Times
तीर्थं सारस्वतं नाम स्वामितीर्थं तथैव च मलंदरा नदी पुण्या कौशिकी चन्द्रिका तथा //
tīrthaṃ sārasvataṃ nāma svāmitīrthaṃ tathaiva ca malaṃdarā nadī puṇyā kauśikī candrikā tathā //
There is the pilgrimage-site called Sārasvata, and likewise Svāmitīrtha; the holy river Malaṃdarā, and also Kauśikī, and Candrikā as well.
This verse does not describe pralaya; it functions as a tīrtha-catalogue, naming sacred pilgrimage places and holy rivers whose visitation is traditionally associated with accruing merit (puṇya).
By listing tīrthas and sacred rivers, it supports the Purāṇic duty of tīrtha-yātrā: rulers and householders are encouraged to honor sacred geography, sponsor pilgrimages, and cultivate dharma through meritorious visits, bathing, and offerings at such places.
The verse is primarily geographical/ritual: it indicates recognized tīrthas and rivers where rites like snāna (sacred bathing), tarpaṇa, and dāna are typically performed; it does not give specific Vāstu or temple-construction rules in this line.