Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
अतः परं प्रवक्ष्यामि सप्तमं द्वीपमुत्तमम् समुद्रेक्षुरसं चैव गोमेदाद्द्विगुणं हि सः //
ataḥ paraṃ pravakṣyāmi saptamaṃ dvīpamuttamam samudrekṣurasaṃ caiva gomedāddviguṇaṃ hi saḥ //
Now I shall describe the seventh and most excellent continent, and also the ocean of sugarcane-juice; it is indeed twice the extent of Gomeda.
This verse is not about Pralaya; it belongs to the Matsya Purana’s cosmography, outlining the structured, proportional arrangement of continents and their surrounding oceans.
Directly it does not prescribe dharma, but it supports the Purāṇic worldview a king is expected to uphold—governance aligned with cosmic order (ṛta), where the universe is described as orderly and measurable.
No explicit Vāstu or ritual rule appears here; the key takeaway is the Purāṇic principle of proportion (dviguṇa, “doubling”), a recurring idea that also informs later traditional proportional thinking in planning and measurement.