Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
कुशद्वीपे कुशस्तम्बो मध्ये जनपदस्य तु क्रौञ्चद्वीपे गिरिः क्रौञ्चस् तस्य नाम्ना निगद्यते //
kuśadvīpe kuśastambo madhye janapadasya tu krauñcadvīpe giriḥ krauñcas tasya nāmnā nigadyate //
In Kuśadvīpa, the Kuśa-stalk (Kuśastamba) stands at the center of the realm; and in Krauñcadvīpa there is the mountain named Krauñca—so it is spoken of by that very name.
This verse does not discuss Pralaya; it belongs to the Matsya Purana’s cosmography section, listing the central markers and names of regions (dvīpas and mountains) in the structured world-order.
Indirectly, it supports royal and civic order by grounding geography and territorial identity (janapadas) in a sacred cosmological map—useful for defining realms, pilgrim routes, and the king’s conception of a well-ordered domain.
The idea of a central marker (madhye) aligns with Vastu thinking about a ‘center’ (madhya/brahmasthāna) as the organizing principle of space, though the verse itself is primarily geographic rather than a direct Vastu rule.