Bhagavatapurana 5.1.31

5.1.31

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ye vā u ha tad-ratha-caraṇa-nemi-kṛta-parikhātās te sapta sindhava āsan yata eva kṛtāḥ sapta bhuvo dvīpāḥ //

31 & 32. The hollows (moats), wonderful as they are, caused by the tyres of the wheels of his chariot, became the seven seas and by those seas seven Dwipas of land are enclosed; they are called Plaksha, Salmali, Kusa, Krouncha, Saka, Jambu and Pushkara. Listen to my description of their dimensions. Every two of the