Valmiki Ramayana Ayodhya Kanda Sarga 95 Shloka 1

अथ then, कोसलेश्वरः lord of Kosala (Rama), शैलात् from the mountain, विनिष्क्रम्य having descended, शुभजलाम् of sacred water, रम्याम् charming, मन्दाकिनीं नदीम् river Mandakini, मैथिलीम् to Sita, अदर्शयत् showed.

Then Rama, the lord of Kosala, descended from the mountain and showed Sita the charming river Mandakini of sacred waters. Rama describes to Sita the beauty of mountains, rivers, birds and animals at Chitrakuta.