Then the four great oceans appeared on all sides, swallowing up the surface of the earth with their wind-tossed waves. In these oceans were terrible sea monsters, fearful whirlpools and ominous rumblings.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ततो व्यदृश्यन्त चतुःसमुद्राः समन्ततः क्ष्मातलमाग्रसन्तः । समीरवेगोर्मिभिरुग्रनक्र- महाभयावर्तगभीरघोषाः
tato vyadṛśyanta catuḥsamudrāḥ samantataḥ kṣmātalamāgrasantaḥ | samīravegormibhirugranakra- mahābhayāvartagabhīraghoṣāḥ
SB 12.9.12