Matsya Purana — Characteristics of Dvāpara and Kali Yugas
सरितः सागरानूपान् सेवन्ते पर्वतानपि चीरकृष्णाजिनधरा निष्क्रिया निष्परिग्रहाः //
saritaḥ sāgarānūpān sevante parvatānapi cīrakṛṣṇājinadharā niṣkriyā niṣparigrahāḥ //
Clad in garments of bark and in black antelope-skins, inactive in worldly pursuits and free from possessions, they dwell by rivers, on seacoasts and marshlands, and also among mountains.
It does not directly discuss pralaya; it instead outlines where renunciants choose to live and the ideals of non-possession (niṣparigraha) and disengagement (niṣkriyā).
By defining the renunciant ideal—minimal needs, no hoarding, and withdrawal from worldly striving—it implicitly guides kings/householders to respect ascetics, support them appropriately, and value restraint and non-attachment in governance and daily life.
No explicit Vastu or temple rule is stated; the practical takeaway is sacred geography for austerity—riversides, coasts/marshlands, and mountains are presented as preferred settings for tapas and contemplative living.