Bhagavatapurana 3.13.31

3.13.31

pātāla-mūleśvara-bhoga-saṃhatau vinyasya pādau pṛthivīṃ ca bibhrataḥ /
yasyopamāno na babhūva so 'cyuto mamāstu māṅgalya-vivṛddhaye hariḥ //

flowed its shores; and at the bottom of the sea on which He would later on rest Himself, He saw the earth, the abode of all beings, and He held her fast to His stomach (bosom).