Matsya Purana — Solar–Lunar Motions
सुषा नाम पुरी रम्या वरुणस्यापि धीमतः दिश्युत्तरस्यां मेरोस्तु मानसस्यैव मूर्धनि //
suṣā nāma purī ramyā varuṇasyāpi dhīmataḥ diśyuttarasyāṃ merostu mānasasyaiva mūrdhani //
There is a lovely city named Suṣā, belonging also to the wise Varuṇa; it lies in the northern quarter, upon the very summit of Mānasā on Mount Meru.
It does not describe Pralaya directly; it situates Varuṇa’s city within the stable cosmographic layout centered on Meru and Mānasā.
Indirectly, it supports the Purāṇic ideal that rulers and householders should know sacred geography—places of divine abodes—since such knowledge underlies pilgrimage, ritual orientation, and cultural memory.
The key ritual significance is directional and locational: the city is placed in the northern quarter and on a ‘summit’ (mūrdhan), reflecting Purāṇic emphasis on auspicious orientation and elevated sacred sites.