Matsya Purana — Cosmography of Śākadvīpa and Successive Dvīpas: Mountains
मनोनुगात्परे चोष्णास् तृतीयो ऽपि स उच्यते उष्णात्परे पावनकः पावनादन्धकारकः //
manonugātpare coṣṇās tṛtīyo 'pi sa ucyate uṣṇātpare pāvanakaḥ pāvanādandhakārakaḥ //
Beyond “Manonuga” (the mind-following region) is “Uṣṇā” (Heat), which is also spoken of as the third. Beyond Heat comes “Pāvanaka” (Wind), and beyond Wind comes “Andhakāraka” (Darkness).
This verse does not describe Pralaya directly; it instead lists sequential environmental indicators (heat, wind, darkness) used in Vāstu evaluation, reflecting how cosmic elements are read as signs in the built environment.
It guides rulers and householders to judge land suitability before building—an aspect of dharma involving safe, auspicious settlement planning and responsible construction aligned with traditional Vāstu standards.
Heat, wind, and darkness are treated as graded site-signs (lakṣaṇas) in Vāstuvidyā—practical cues used during ritualized site-selection to determine whether a plot is favorable or inauspicious for building.