Bhagavatapurana 5.20.38

5.20.38

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etāvān loka-vinyāso māna-lakṣaṇa-saṃsthābhir vicintitaḥ kavibhiḥ sa tu pañcāśat-koṭi-gaṇitasya bhū-golasya turīya-bhāgo 'yaṃ lokālokācalaḥ //

38. So far has been described the disposition of the regions lighted by the sun with details of dimensions, characteristics and relative positions and its extent is considerd by the wise to be fifty crores of Yojanas. The chain of Lokaloka mountains occupies a fourth of the area of the globe just measured.