Matsya Purana — The Cave-Sanctuary: Jewel-Lake
तथापि दिवसाकारं प्रकाशं तदहर्निशम् क्रोशाधिकपरीमाणं सरसा च विराजितम् //
tathāpi divasākāraṃ prakāśaṃ tadaharniśam krośādhikaparīmāṇaṃ sarasā ca virājitam //
Even so, it shines with a daylight-like radiance, day and night; it extends for more than a krośa in measure, and is beautified by a lake.
This verse does not describe pralaya directly; it characterizes an auspicious region as perpetually luminous and associated with a lake—features used in Purāṇic sacred geography rather than cosmic dissolution.
For kings and householders, such descriptions function as practical guidance for choosing auspicious sites—favoring well-watered, clearly measured, and ritually “bright” places for settlements, temples, or charitable works (tanks, ghāṭas).
The key markers are (1) measurable extent (krośa-based planning) and (2) proximity to a lake, supporting Vāstu-oriented site selection and tirtha/temple landscaping where water is a primary auspicious element.