Matsya Purana — The Cave-Sanctuary: Jewel-Lake
बिलद्वारसमो देशो यत्र यत्र हिरण्मयः प्रदेशः स तु राजेन्द्र द्वीपे तस्मिन्मनोहरे //
biladvārasamo deśo yatra yatra hiraṇmayaḥ pradeśaḥ sa tu rājendra dvīpe tasminmanohare //
O best of kings, on that enchanting island the land is like the mouth of a cavern; and here and there the region shines as though made of gold.
This verse is not directly about Pralaya; it describes the wondrous physical features of an island-region, emphasizing its extraordinary, almost otherworldly terrain and golden appearance.
By addressing the king and describing idealized, auspicious terrain, the verse supports a ruler’s broader duty to understand land and regions—knowledge that underlies settlement, protection, and prosperity in Puranic statecraft.
The focus is on land-characteristics (deśa/pradeśa) and auspiciousness; such descriptions align with Vastu-style evaluation of terrain, where notable features and luminous/“golden” qualities signify an exceptional, sacred, or highly auspicious site.