Vaishnava Dharmashastra 1.12

1.12

evaṃ yajñavarāheṇa bhūtvā bhūtahitārthinā
uddhṛtā pṛthivī devī rasātalagatā purā //

Thus the whole earth, after having sunk into (the lower region called) Rasâtala, was in the first place raised in the boar-incarnation by Vishnu, who took compassion upon the living beings.
13, 14. Then, after having raised the earth, the destroyer of Madhu placed and fixed it upon its own (former) seat (upon the oceans) and distributed the waters upon it according to their own (former) station, conducting the floods of the oceans into the oceans, the water of the rivers into the rivers, the water of the tanks into the tanks, and the water of the lakes into the lakes.