Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 21

Sanskrit:

विप्लावितं स्वशिबिरं प्रतिस्रोत:सरिज्जलै: ।नामृष्यत् तस्य तद् वीर्यं वीरमानी दशानन: ॥ २१ ॥

ITRANS:

viplāvitaṁ sva-śibiraṁpratisrotaḥ-sarij-jalaiḥnāmṛṣyat tasya tad vīryaṁvīramānī daśānanaḥ

Translation:

Because Kārtavīryārjuna made the water flow in the opposite direction, the camp of Rāvaṇa, which was set up on the bank of the Narmadā near the city of Māhiṣmatī, was inundated. This was unbearable to the ten-headed Rāvaṇa, who considered himself a great hero and could not tolerate Kārtavīryārjuna’s power.

Purport:

Rāvaṇa was out touring to gain victory over all other countries (dig-vijaya), and he had camped on the bank of the Narmadā River near the city of Māhiṣmatī.