Bhagavatapurana 5.20.29

5.20.29

evam eva dadhi-maṇḍodāt parataḥ puṣkaradvīpas tato dvi-guṇāyāmaḥ samantata upakalpitaḥ samānena svādūdakena samudreṇa bahir āvṛto yasmin bṛhat-puṣkaraṃ jvalana-śikhāmala-kanaka-patrāyutāyutaṃ bhagavataḥ kamalāsanasyādhyāsanaṃ parikalpitam //

29. So also beyond the sea of curds lies Pushkara Dwipa, double in extent, surrounded by the sea of fresh water, equal in extent to itself; in this sea is to be found a gigantic lotus of hundred million (D. ten thousand) golden petals refulgent like the flames of fire and intended to be the throne of Brahma the lotus-born.