Ramayana 2.49.12

गोमतीं चाप्यतिक्रम्य राघवः शीघ्रगैर्हयैः।मयूरहंसाभिरुतां ततार स्यन्दिकां नदीम्।।।।

gomatīṁ cāpy atikramya rāghavaḥ śīghragair hayaiḥ | mayūra-haṁsābhirutāṁ tatāra syandikāṁ nadīm ||

And after crossing the Gomati, Rāghava, borne by swift horses, crossed the river Syandikā, resonant with the calls of peacocks and swans.