Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
षष्ठेन तु समुद्रेण सुरोदाद्द्विगुणेन च धातकीकुमुदश्चैव हव्यपुत्रौ सुविस्तृतौ //
ṣaṣṭhena tu samudreṇa surodāddviguṇena ca dhātakīkumudaścaiva havyaputrau suvistṛtau //
And then, beyond it, there is the sixth ocean, called Surodā, twice the extent of the preceding one; and there lie the vast lands Dhātakī and Kumuda, the two sons of Havya, spread out widely.
This verse is not about Pralaya; it belongs to cosmography, describing the layered structure of the world—successive oceans and vast regions—presented as part of the ordered creation.
Directly it does not prescribe duties; indirectly, Matsya Purana’s cosmography frames dharma by placing human society within a vast, orderly cosmos—supporting ideals of righteous rule and disciplined household life aligned with cosmic order.
No Vāstu or ritual procedure is stated here; the significance is contextual—cosmic layout and proportional expansion (dviguṇa) often inform Purāṇic ways of thinking about sacred space and scale, later echoed in temple-architecture symbolism.