Ramayana
ततो रसातलं गच्छन् प्रविष्टः पयसां निधिम् । दैत्योरगगणाध्युष्टं वरुणेन सुरक्षितम् ॥ 7-23-4 ॥
Then, going down to Rasatala, he entered the abode of the waters (the ocean), crowded with hosts of Daityas and Nagas and well guarded by Varuna.
english translation