Ramayana
राक्षसेन्द्रगजैस्तैस्तु क्षोभिता नर्मदा नदी । वामनाञ्जनपद्माद्यैर्गङ्गा इव महागजैः ॥ 7-31-35 ॥
By those elephant-like lords of rakshasas the river Narmada was stirred up, as the Ganga is by great elephants such as Vamana, Anjana, Padma, and the rest.
english translation