In order to humour Sita, Sri Rama gives a description of the river Mandakini to her.
Recitation: 
Translation: 

Ayodhya Kanda Sarga 96 "Bharatham Prathi Lakshmana Vikalpaha" (Book 2 Canto 96)

This podcast includes an authentic Sanskrit recitation and the reading of a genuine translation in English by Gita Press, Gorakhpur, India. This is not a western translation of the Valmiki Ramayana, nor a re-telling in any form. It is translated by Hindus from within the tradition, and it is thereby recommended as the most authentic recitation and English reading available.

The Ramayana recitation by Sriram-ghanapaathi HariSitaramamurti-ghanapathi is taken from archive.org. The reading is from the English version of Srimad Valmiki Ramayan translation by Gita Press, Gorakhpur, India.