Bhūtasarga-Prakaraṇa
Account of Elemental Creation from Avyakta to Mahat
पर्वतैः सुमहद्भिश्च नदीभिश्च सहस्रशः / अन्तःस्थस्य त्विमे लोका अन्तर्विश्वमिदं जगत्
parvataiḥ sumahadbhiśca nadībhiśca sahasraśaḥ / antaḥsthasya tvime lokā antarviśvamidaṃ jagat
With mighty mountains and rivers by the thousand, these worlds abide within that Egg; this very creation is the inner universe.