Valmiki Ramayana Ayodhya Kanda Sarga 55 Shloka 22

तत: then, शीघ्रगाम् swiftflowing, ऊर्मिमालिनीम् full of waves, तीरजै: growing on the banks, बहुभि: many, वृक्षै: trees, अंशुमतीम् daughter of the Sungod, यमुनां नदीम् river Yamuna, सन्तेरु: crossed.

They crossed the swiftflowing river Yamuna, daughter of the Sungod, full of waves and with trees growing thick on her banks.