Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 2
Sanskrit:
तत्रापि प्रियव्रतरथचरणपरिखातै: सप्तभि: सप्त सिन्धव उपक्लृप्ता यत एतस्या: सप्तद्वीपविशेषविकल्पस्त्वया भगवन् खलु सूचित एतदेवाखिलमहं मानतो लक्षणतश्च सर्वं विजिज्ञासामि ॥ २ ॥
ITRANS:
tatrāpi priyavrata-ratha-caraṇa-parikhātaiḥ saptabhiḥ sapta sindhava upakḷptā yata etasyāḥ sapta-dvīpa-viśeṣa-vikalpas tvayā bhagavan khalu sūcita etad evākhilam ahaṁ mānato lakṣaṇataś ca sarvaṁ vi-jijñāsāmi.
Translation:
My dear Lord, the rolling wheels of Mahārāja Priyavrata’s chariot created seven ditches, in which the seven oceans came into existence. Because of these seven oceans, Bhū-maṇḍala is divided into seven islands. You have given a very general description of their measurement, names and characteristics. Now I wish to know of them in detail. Kindly fulfill my desire.