Bhagavatapurana 3.28.24.p3

3.28.24.p3

nābhi-hradaṃ bhuvana-kośa-guhodara-sthaṃ $ yatrātma-yoni-dhiṣaṇākhila-loka-padmam &

the lake of His navel situated in the cavern of His belly containing the egg of the universe, / wherein grew the lotus of all the worlds, the dwelling place of the self-born [Brahmā];