Bhagavatapurana 5.16.2

5.16.2

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tatrāpi priyavrata-ratha-caraṇa-parikhātaiḥ saptabhiḥ sapta sindhava upakḷptā yata etasyāḥ sapta-dvīpa-viśeṣa-vikalpas tvayā bhagavan khalu sūcita etad evākhilam ahaṃ mānato lakṣaṇataś ca sarvaṃ vi-jijñāsāmi //

2. It has also been pointed out that there the seven seas were formed by the seven moats caused by the wheels of Priyavrata's chariot, as well as the distinction of the Seven Dwipas or divisions of the Earth. I desire to know all this in detail with their dimensions and characteristics.